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Finding the Fourth Proportional to 932.74, 1,287.21 and 699.46

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Solution

The fourth proportional to 932.74, 1,287.21 and 699.46 is: 965.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    932.74 : 1,287.21 = 699.46 : x
  2. Step 2: Convert to fraction form
    932.74/1,287.21 = 699.46/x
  3. Step 3: Cross multiply
    932.74x = 1,287.21 × 699.46
  4. Step 4: Simplify right side
    932.74x = 900,351.91
  5. Step 5: Solve for x
    x = 900,351.91/932.74
  6. Step 6: Final answer
    x = 965.28

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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.