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Finding the Fourth Proportional to 752.43, 1,038.41 and 420.85

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Solution

The fourth proportional to 752.43, 1,038.41 and 420.85 is: 580.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    752.43 : 1,038.41 = 420.85 : x
  2. Step 2: Convert to fraction form
    752.43/1,038.41 = 420.85/x
  3. Step 3: Cross multiply
    752.43x = 1,038.41 × 420.85
  4. Step 4: Simplify right side
    752.43x = 437,010.15
  5. Step 5: Solve for x
    x = 437,010.15/752.43
  6. Step 6: Final answer
    x = 580.80

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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.