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Finding the Fourth Proportional to 272,438.28, 408,726.54 and 85,451.40

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Solution

The fourth proportional to 272,438.28, 408,726.54 and 85,451.40 is: 128,198.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    272,438.28 : 408,726.54 = 85,451.40 : x
  2. Step 2: Convert to fraction form
    272,438.28/408,726.54 = 85,451.40/x
  3. Step 3: Cross multiply
    272,438.28x = 408,726.54 × 85,451.40
  4. Step 4: Simplify right side
    272,438.28x = 34,926,255,060.16
  5. Step 5: Solve for x
    x = 34,926,255,060.16/272,438.28
  6. Step 6: Final answer
    x = 128,198.78

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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.