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Finding the Fourth Proportional to 891.78, 1,337.40 and 458.88

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Solution

The fourth proportional to 891.78, 1,337.40 and 458.88 is: 688.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    891.78 : 1,337.40 = 458.88 : x
  2. Step 2: Convert to fraction form
    891.78/1,337.40 = 458.88/x
  3. Step 3: Cross multiply
    891.78x = 1,337.40 × 458.88
  4. Step 4: Simplify right side
    891.78x = 613,706.11
  5. Step 5: Solve for x
    x = 613,706.11/891.78
  6. Step 6: Final answer
    x = 688.18

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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.