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Finding the Fourth Proportional to 752.27, 1,038.15 and 420.71

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Solution

The fourth proportional to 752.27, 1,038.15 and 420.71 is: 580.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    752.27 : 1,038.15 = 420.71 : x
  2. Step 2: Convert to fraction form
    752.27/1,038.15 = 420.71/x
  3. Step 3: Cross multiply
    752.27x = 1,038.15 × 420.71
  4. Step 4: Simplify right side
    752.27x = 436,754.90
  5. Step 5: Solve for x
    x = 436,754.90/752.27
  6. Step 6: Final answer
    x = 580.59

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.