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Finding the Fourth Proportional to 287,726.80, 431,719.80 and 137,909.20

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Solution

The fourth proportional to 287,726.80, 431,719.80 and 137,909.20 is: 206,925.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,726.80 : 431,719.80 = 137,909.20 : x
  2. Step 2: Convert to fraction form
    287,726.80/431,719.80 = 137,909.20/x
  3. Step 3: Cross multiply
    287,726.80x = 431,719.80 × 137,909.20
  4. Step 4: Simplify right side
    287,726.80x = 59,538,132,242.16
  5. Step 5: Solve for x
    x = 59,538,132,242.16/287,726.80
  6. Step 6: Final answer
    x = 206,925.92

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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.