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Finding the Fourth Proportional to 743.76, 1,023.96 and 694.74

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Solution

The fourth proportional to 743.76, 1,023.96 and 694.74 is: 956.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    743.76 : 1,023.96 = 694.74 : x
  2. Step 2: Convert to fraction form
    743.76/1,023.96 = 694.74/x
  3. Step 3: Cross multiply
    743.76x = 1,023.96 × 694.74
  4. Step 4: Simplify right side
    743.76x = 711,385.97
  5. Step 5: Solve for x
    x = 711,385.97/743.76
  6. Step 6: Final answer
    x = 956.47

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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.