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Finding the Fourth Proportional to 752.24, 1,038.11 and 420.66

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Solution

The fourth proportional to 752.24, 1,038.11 and 420.66 is: 580.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    752.24 : 1,038.11 = 420.66 : x
  2. Step 2: Convert to fraction form
    752.24/1,038.11 = 420.66/x
  3. Step 3: Cross multiply
    752.24x = 1,038.11 × 420.66
  4. Step 4: Simplify right side
    752.24x = 436,691.35
  5. Step 5: Solve for x
    x = 436,691.35/752.24
  6. Step 6: Final answer
    x = 580.52

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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.