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Finding the Fourth Proportional to 278,143.20, 417,117.60 and 144,979.20

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Solution

The fourth proportional to 278,143.20, 417,117.60 and 144,979.20 is: 217,418.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    278,143.20 : 417,117.60 = 144,979.20 : x
  2. Step 2: Convert to fraction form
    278,143.20/417,117.60 = 144,979.20/x
  3. Step 3: Cross multiply
    278,143.20x = 417,117.60 × 144,979.20
  4. Step 4: Simplify right side
    278,143.20x = 60,473,375,953.92
  5. Step 5: Solve for x
    x = 60,473,375,953.92/278,143.20
  6. Step 6: Final answer
    x = 217,418.14

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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.