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Finding the Fourth Proportional to 752.24, 1,037.57 and 639.92

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Solution

The fourth proportional to 752.24, 1,037.57 and 639.92 is: 882.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    752.24 : 1,037.57 = 639.92 : x
  2. Step 2: Convert to fraction form
    752.24/1,037.57 = 639.92/x
  3. Step 3: Cross multiply
    752.24x = 1,037.57 × 639.92
  4. Step 4: Simplify right side
    752.24x = 663,955.01
  5. Step 5: Solve for x
    x = 663,955.01/752.24
  6. Step 6: Final answer
    x = 882.64

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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.