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Finding the Fourth Proportional to 891.95, 1,337.82 and 423.31

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Solution

The fourth proportional to 891.95, 1,337.82 and 423.31 is: 634.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    891.95 : 1,337.82 = 423.31 : x
  2. Step 2: Convert to fraction form
    891.95/1,337.82 = 423.31/x
  3. Step 3: Cross multiply
    891.95x = 1,337.82 × 423.31
  4. Step 4: Simplify right side
    891.95x = 566,312.58
  5. Step 5: Solve for x
    x = 566,312.58/891.95
  6. Step 6: Final answer
    x = 634.92

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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.