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Finding the Fourth Proportional to 959.92, 1,440.08 and 382.80

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Solution

The fourth proportional to 959.92, 1,440.08 and 382.80 is: 574.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    959.92 : 1,440.08 = 382.80 : x
  2. Step 2: Convert to fraction form
    959.92/1,440.08 = 382.80/x
  3. Step 3: Cross multiply
    959.92x = 1,440.08 × 382.80
  4. Step 4: Simplify right side
    959.92x = 551,262.62
  5. Step 5: Solve for x
    x = 551,262.62/959.92
  6. Step 6: Final answer
    x = 574.28

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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.