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Finding the Fourth Proportional to 925.70, 1,276.71 and 663.86

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Solution

The fourth proportional to 925.70, 1,276.71 and 663.86 is: 915.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    925.70 : 1,276.71 = 663.86 : x
  2. Step 2: Convert to fraction form
    925.70/1,276.71 = 663.86/x
  3. Step 3: Cross multiply
    925.70x = 1,276.71 × 663.86
  4. Step 4: Simplify right side
    925.70x = 847,556.70
  5. Step 5: Solve for x
    x = 847,556.70/925.70
  6. Step 6: Final answer
    x = 915.58

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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.