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Finding the Fourth Proportional to 278,459.60, 417,689.40 and 91,446.80

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Solution

The fourth proportional to 278,459.60, 417,689.40 and 91,446.80 is: 137,170.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    278,459.60 : 417,689.40 = 91,446.80 : x
  2. Step 2: Convert to fraction form
    278,459.60/417,689.40 = 91,446.80/x
  3. Step 3: Cross multiply
    278,459.60x = 417,689.40 × 91,446.80
  4. Step 4: Simplify right side
    278,459.60x = 38,196,359,023.92
  5. Step 5: Solve for x
    x = 38,196,359,023.92/278,459.60
  6. Step 6: Final answer
    x = 137,170.20

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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.