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Finding the Fourth Proportional to 752.52, 1,039.98 and 643.17

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Solution

The fourth proportional to 752.52, 1,039.98 and 643.17 is: 888.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    752.52 : 1,039.98 = 643.17 : x
  2. Step 2: Convert to fraction form
    752.52/1,039.98 = 643.17/x
  3. Step 3: Cross multiply
    752.52x = 1,039.98 × 643.17
  4. Step 4: Simplify right side
    752.52x = 668,883.94
  5. Step 5: Solve for x
    x = 668,883.94/752.52
  6. Step 6: Final answer
    x = 888.86

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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.