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Finding the Fourth Proportional to 85,508.40, 128,416.20 and 82,743.60

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Solution

The fourth proportional to 85,508.40, 128,416.20 and 82,743.60 is: 124,264.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,508.40 : 128,416.20 = 82,743.60 : x
  2. Step 2: Convert to fraction form
    85,508.40/128,416.20 = 82,743.60/x
  3. Step 3: Cross multiply
    85,508.40x = 128,416.20 × 82,743.60
  4. Step 4: Simplify right side
    85,508.40x = 10,625,618,686.32
  5. Step 5: Solve for x
    x = 10,625,618,686.32/85,508.40
  6. Step 6: Final answer
    x = 124,264.03

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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.