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Finding the Fourth Proportional to 762.08, 1,143.68 and 547.20

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Solution

The fourth proportional to 762.08, 1,143.68 and 547.20 is: 821.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    762.08 : 1,143.68 = 547.20 : x
  2. Step 2: Convert to fraction form
    762.08/1,143.68 = 547.20/x
  3. Step 3: Cross multiply
    762.08x = 1,143.68 × 547.20
  4. Step 4: Simplify right side
    762.08x = 625,821.70
  5. Step 5: Solve for x
    x = 625,821.70/762.08
  6. Step 6: Final answer
    x = 821.20

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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.