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Finding the Fourth Proportional to 1,172.39, 1,757.18 and 478.13

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Solution

The fourth proportional to 1,172.39, 1,757.18 and 478.13 is: 716.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,172.39 : 1,757.18 = 478.13 : x
  2. Step 2: Convert to fraction form
    1,172.39/1,757.18 = 478.13/x
  3. Step 3: Cross multiply
    1,172.39x = 1,757.18 × 478.13
  4. Step 4: Simplify right side
    1,172.39x = 840,149.30
  5. Step 5: Solve for x
    x = 840,149.30/1,172.39
  6. Step 6: Final answer
    x = 716.62

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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.