Home / 81,010.10-121,515.15-73,136.90

Finding the Fourth Proportional to 81,010.10, 121,515.15 and 73,136.90

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Solution

The fourth proportional to 81,010.10, 121,515.15 and 73,136.90 is: 109,705.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,010.10 : 121,515.15 = 73,136.90 : x
  2. Step 2: Convert to fraction form
    81,010.10/121,515.15 = 73,136.90/x
  3. Step 3: Cross multiply
    81,010.10x = 121,515.15 × 73,136.90
  4. Step 4: Simplify right side
    81,010.10x = 8,887,241,374.04
  5. Step 5: Solve for x
    x = 8,887,241,374.04/81,010.10
  6. Step 6: Final answer
    x = 109,705.35

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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.