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Finding the Fourth Proportional to 720, 1,079.28 and 395.52

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Solution

The fourth proportional to 720, 1,079.28 and 395.52 is: 592.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    720 : 1,079.28 = 395.52 : x
  2. Step 2: Convert to fraction form
    720/1,079.28 = 395.52/x
  3. Step 3: Cross multiply
    720x = 1,079.28 × 395.52
  4. Step 4: Simplify right side
    720x = 426,876.83
  5. Step 5: Solve for x
    x = 426,876.83/720
  6. Step 6: Final answer
    x = 592.88

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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.