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Finding the Fourth Proportional to 761.27, 1,143.74 and 487.90

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Solution

The fourth proportional to 761.27, 1,143.74 and 487.90 is: 733.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    761.27 : 1,143.74 = 487.90 : x
  2. Step 2: Convert to fraction form
    761.27/1,143.74 = 487.90/x
  3. Step 3: Cross multiply
    761.27x = 1,143.74 × 487.90
  4. Step 4: Simplify right side
    761.27x = 558,025.45
  5. Step 5: Solve for x
    x = 558,025.45/761.27
  6. Step 6: Final answer
    x = 733.02

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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.