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Finding the Fourth Proportional to 85,165.86, 127,748.10 and 21,980.58

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Solution

The fourth proportional to 85,165.86, 127,748.10 and 21,980.58 is: 32,970.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,165.86 : 127,748.10 = 21,980.58 : x
  2. Step 2: Convert to fraction form
    85,165.86/127,748.10 = 21,980.58/x
  3. Step 3: Cross multiply
    85,165.86x = 127,748.10 × 21,980.58
  4. Step 4: Simplify right side
    85,165.86x = 2,807,977,331.90
  5. Step 5: Solve for x
    x = 2,807,977,331.90/85,165.86
  6. Step 6: Final answer
    x = 32,970.69

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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.