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Finding the Fourth Proportional to 753, 1,129.20 and 521.88

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Solution

The fourth proportional to 753, 1,129.20 and 521.88 is: 782.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    753 : 1,129.20 = 521.88 : x
  2. Step 2: Convert to fraction form
    753/1,129.20 = 521.88/x
  3. Step 3: Cross multiply
    753x = 1,129.20 × 521.88
  4. Step 4: Simplify right side
    753x = 589,306.90
  5. Step 5: Solve for x
    x = 589,306.90/753
  6. Step 6: Final answer
    x = 782.61

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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.