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Finding the Fourth Proportional to 278,890.60, 418,335.90 and 91,877.80

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Solution

The fourth proportional to 278,890.60, 418,335.90 and 91,877.80 is: 137,816.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    278,890.60 : 418,335.90 = 91,877.80 : x
  2. Step 2: Convert to fraction form
    278,890.60/418,335.90 = 91,877.80/x
  3. Step 3: Cross multiply
    278,890.60x = 418,335.90 × 91,877.80
  4. Step 4: Simplify right side
    278,890.60x = 38,435,782,153.02
  5. Step 5: Solve for x
    x = 38,435,782,153.02/278,890.60
  6. Step 6: Final answer
    x = 137,816.70

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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.