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Finding the Fourth Proportional to 921.28, 1,378.92 and 592.42

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Solution

The fourth proportional to 921.28, 1,378.92 and 592.42 is: 886.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.28 : 1,378.92 = 592.42 : x
  2. Step 2: Convert to fraction form
    921.28/1,378.92 = 592.42/x
  3. Step 3: Cross multiply
    921.28x = 1,378.92 × 592.42
  4. Step 4: Simplify right side
    921.28x = 816,899.79
  5. Step 5: Solve for x
    x = 816,899.79/921.28
  6. Step 6: Final answer
    x = 886.70

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.