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Finding the Fourth Proportional to 742.19, 1,023.82 and 689.40

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Solution

The fourth proportional to 742.19, 1,023.82 and 689.40 is: 951.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    742.19 : 1,023.82 = 689.40 : x
  2. Step 2: Convert to fraction form
    742.19/1,023.82 = 689.40/x
  3. Step 3: Cross multiply
    742.19x = 1,023.82 × 689.40
  4. Step 4: Simplify right side
    742.19x = 705,819.78
  5. Step 5: Solve for x
    x = 705,819.78/742.19
  6. Step 6: Final answer
    x = 951.00

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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.