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Finding the Fourth Proportional to 742.10, 1,023.09 and 625.46

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Solution

The fourth proportional to 742.10, 1,023.09 and 625.46 is: 862.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    742.10 : 1,023.09 = 625.46 : x
  2. Step 2: Convert to fraction form
    742.10/1,023.09 = 625.46/x
  3. Step 3: Cross multiply
    742.10x = 1,023.09 × 625.46
  4. Step 4: Simplify right side
    742.10x = 639,901.87
  5. Step 5: Solve for x
    x = 639,901.87/742.10
  6. Step 6: Final answer
    x = 862.29

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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.