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Finding the Fourth Proportional to 878,417.20, 1,317,612 and 279,369.76

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Solution

The fourth proportional to 878,417.20, 1,317,612 and 279,369.76 is: 419,050.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    878,417.20 : 1,317,612 = 279,369.76 : x
  2. Step 2: Convert to fraction form
    878,417.20/1,317,612 = 279,369.76/x
  3. Step 3: Cross multiply
    878,417.20x = 1,317,612 × 279,369.76
  4. Step 4: Simplify right side
    878,417.20x = 368,100,948,213.12
  5. Step 5: Solve for x
    x = 368,100,948,213.12/878,417.20
  6. Step 6: Final answer
    x = 419,050.25

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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.