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Finding the Fourth Proportional to 749.97, 1,125.09 and 642.51

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Solution

The fourth proportional to 749.97, 1,125.09 and 642.51 is: 963.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    749.97 : 1,125.09 = 642.51 : x
  2. Step 2: Convert to fraction form
    749.97/1,125.09 = 642.51/x
  3. Step 3: Cross multiply
    749.97x = 1,125.09 × 642.51
  4. Step 4: Simplify right side
    749.97x = 722,881.58
  5. Step 5: Solve for x
    x = 722,881.58/749.97
  6. Step 6: Final answer
    x = 963.88

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.