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Finding the Fourth Proportional to 278,820.10, 418,230.15 and 91,807.30

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Solution

The fourth proportional to 278,820.10, 418,230.15 and 91,807.30 is: 137,710.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    278,820.10 : 418,230.15 = 91,807.30 : x
  2. Step 2: Convert to fraction form
    278,820.10/418,230.15 = 91,807.30/x
  3. Step 3: Cross multiply
    278,820.10x = 418,230.15 × 91,807.30
  4. Step 4: Simplify right side
    278,820.10x = 38,396,580,850.10
  5. Step 5: Solve for x
    x = 38,396,580,850.10/278,820.10
  6. Step 6: Final answer
    x = 137,710.95

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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.