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Finding the Fourth Proportional to 762.80, 1,143.08 and 454.72

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Solution

The fourth proportional to 762.80, 1,143.08 and 454.72 is: 681.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    762.80 : 1,143.08 = 454.72 : x
  2. Step 2: Convert to fraction form
    762.80/1,143.08 = 454.72/x
  3. Step 3: Cross multiply
    762.80x = 1,143.08 × 454.72
  4. Step 4: Simplify right side
    762.80x = 519,781.34
  5. Step 5: Solve for x
    x = 519,781.34/762.80
  6. Step 6: Final answer
    x = 681.41

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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.