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Finding the Fourth Proportional to 86,419.80, 129,726.90 and 66,785.40

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Solution

The fourth proportional to 86,419.80, 129,726.90 and 66,785.40 is: 100,253.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,419.80 : 129,726.90 = 66,785.40 : x
  2. Step 2: Convert to fraction form
    86,419.80/129,726.90 = 66,785.40/x
  3. Step 3: Cross multiply
    86,419.80x = 129,726.90 × 66,785.40
  4. Step 4: Simplify right side
    86,419.80x = 8,663,862,907.26
  5. Step 5: Solve for x
    x = 8,663,862,907.26/86,419.80
  6. Step 6: Final answer
    x = 100,253.22

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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.