Home / 100,685.38-138,915.04-66,220.29

Finding the Fourth Proportional to 100,685.38, 138,915.04 and 66,220.29

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Solution

The fourth proportional to 100,685.38, 138,915.04 and 66,220.29 is: 91,363.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,685.38 : 138,915.04 = 66,220.29 : x
  2. Step 2: Convert to fraction form
    100,685.38/138,915.04 = 66,220.29/x
  3. Step 3: Cross multiply
    100,685.38x = 138,915.04 × 66,220.29
  4. Step 4: Simplify right side
    100,685.38x = 9,198,994,234.16
  5. Step 5: Solve for x
    x = 9,198,994,234.16/100,685.38
  6. Step 6: Final answer
    x = 91,363.75

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.