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Finding the Fourth Proportional to 752.73, 1,038.81 and 642.16

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Solution

The fourth proportional to 752.73, 1,038.81 and 642.16 is: 886.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    752.73 : 1,038.81 = 642.16 : x
  2. Step 2: Convert to fraction form
    752.73/1,038.81 = 642.16/x
  3. Step 3: Cross multiply
    752.73x = 1,038.81 × 642.16
  4. Step 4: Simplify right side
    752.73x = 667,082.23
  5. Step 5: Solve for x
    x = 667,082.23/752.73
  6. Step 6: Final answer
    x = 886.22

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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.