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Finding the Fourth Proportional to 781.92, 1,172.88 and 295.20

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Solution

The fourth proportional to 781.92, 1,172.88 and 295.20 is: 442.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    781.92 : 1,172.88 = 295.20 : x
  2. Step 2: Convert to fraction form
    781.92/1,172.88 = 295.20/x
  3. Step 3: Cross multiply
    781.92x = 1,172.88 × 295.20
  4. Step 4: Simplify right side
    781.92x = 346,234.18
  5. Step 5: Solve for x
    x = 346,234.18/781.92
  6. Step 6: Final answer
    x = 442.80

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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.