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Finding the Fourth Proportional to 925.56, 1,276.92 and 663.84

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Solution

The fourth proportional to 925.56, 1,276.92 and 663.84 is: 915.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    925.56 : 1,276.92 = 663.84 : x
  2. Step 2: Convert to fraction form
    925.56/1,276.92 = 663.84/x
  3. Step 3: Cross multiply
    925.56x = 1,276.92 × 663.84
  4. Step 4: Simplify right side
    925.56x = 847,670.57
  5. Step 5: Solve for x
    x = 847,670.57/925.56
  6. Step 6: Final answer
    x = 915.85

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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.