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Finding the Fourth Proportional to 278,873.60, 418,310.40 and 91,860.80

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Solution

The fourth proportional to 278,873.60, 418,310.40 and 91,860.80 is: 137,791.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    278,873.60 : 418,310.40 = 91,860.80 : x
  2. Step 2: Convert to fraction form
    278,873.60/418,310.40 = 91,860.80/x
  3. Step 3: Cross multiply
    278,873.60x = 418,310.40 × 91,860.80
  4. Step 4: Simplify right side
    278,873.60x = 38,426,327,992.32
  5. Step 5: Solve for x
    x = 38,426,327,992.32/278,873.60
  6. Step 6: Final answer
    x = 137,791.20

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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.