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Finding the Fourth Proportional to 85,657.26, 128,485.90 and 29,498.76

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Solution

The fourth proportional to 85,657.26, 128,485.90 and 29,498.76 is: 44,248.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,657.26 : 128,485.90 = 29,498.76 : x
  2. Step 2: Convert to fraction form
    85,657.26/128,485.90 = 29,498.76/x
  3. Step 3: Cross multiply
    85,657.26x = 128,485.90 × 29,498.76
  4. Step 4: Simplify right side
    85,657.26x = 3,790,174,727.48
  5. Step 5: Solve for x
    x = 3,790,174,727.48/85,657.26
  6. Step 6: Final answer
    x = 44,248.14

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.