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Finding the Fourth Proportional to 278,700.60, 418,026.60 and 91,712.10

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Solution

The fourth proportional to 278,700.60, 418,026.60 and 91,712.10 is: 137,560.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    278,700.60 : 418,026.60 = 91,712.10 : x
  2. Step 2: Convert to fraction form
    278,700.60/418,026.60 = 91,712.10/x
  3. Step 3: Cross multiply
    278,700.60x = 418,026.60 × 91,712.10
  4. Step 4: Simplify right side
    278,700.60x = 38,338,097,341.86
  5. Step 5: Solve for x
    x = 38,338,097,341.86/278,700.60
  6. Step 6: Final answer
    x = 137,560.15

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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.