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Finding the Fourth Proportional to 891.61, 1,337.28 and 429.27

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Solution

The fourth proportional to 891.61, 1,337.28 and 429.27 is: 643.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    891.61 : 1,337.28 = 429.27 : x
  2. Step 2: Convert to fraction form
    891.61/1,337.28 = 429.27/x
  3. Step 3: Cross multiply
    891.61x = 1,337.28 × 429.27
  4. Step 4: Simplify right side
    891.61x = 574,047.56
  5. Step 5: Solve for x
    x = 574,047.56/891.61
  6. Step 6: Final answer
    x = 643.83

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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.