Home / 100,681.38-138,909.53-66,216.29

Finding the Fourth Proportional to 100,681.38, 138,909.53 and 66,216.29

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Solution

The fourth proportional to 100,681.38, 138,909.53 and 66,216.29 is: 91,358.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,681.38 : 138,909.53 = 66,216.29 : x
  2. Step 2: Convert to fraction form
    100,681.38/138,909.53 = 66,216.29/x
  3. Step 3: Cross multiply
    100,681.38x = 138,909.53 × 66,216.29
  4. Step 4: Simplify right side
    100,681.38x = 9,198,073,193.24
  5. Step 5: Solve for x
    x = 9,198,073,193.24/100,681.38
  6. Step 6: Final answer
    x = 91,358.24

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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.