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Finding the Fourth Proportional to 278,469.38, 417,637.17 and 128,565.72

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Solution

The fourth proportional to 278,469.38, 417,637.17 and 128,565.72 is: 192,817.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    278,469.38 : 417,637.17 = 128,565.72 : x
  2. Step 2: Convert to fraction form
    278,469.38/417,637.17 = 128,565.72/x
  3. Step 3: Cross multiply
    278,469.38x = 417,637.17 × 128,565.72
  4. Step 4: Simplify right side
    278,469.38x = 53,693,823,459.81
  5. Step 5: Solve for x
    x = 53,693,823,459.81/278,469.38
  6. Step 6: Final answer
    x = 192,817.69

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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.