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Finding the Fourth Proportional to 278,703.60, 418,031.10 and 91,715.10

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Solution

The fourth proportional to 278,703.60, 418,031.10 and 91,715.10 is: 137,564.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    278,703.60 : 418,031.10 = 91,715.10 : x
  2. Step 2: Convert to fraction form
    278,703.60/418,031.10 = 91,715.10/x
  3. Step 3: Cross multiply
    278,703.60x = 418,031.10 × 91,715.10
  4. Step 4: Simplify right side
    278,703.60x = 38,339,764,139.61
  5. Step 5: Solve for x
    x = 38,339,764,139.61/278,703.60
  6. Step 6: Final answer
    x = 137,564.65

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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.