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Finding the Fourth Proportional to 891.78, 1,337.68 and 314.66

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Solution

The fourth proportional to 891.78, 1,337.68 and 314.66 is: 471.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    891.78 : 1,337.68 = 314.66 : x
  2. Step 2: Convert to fraction form
    891.78/1,337.68 = 314.66/x
  3. Step 3: Cross multiply
    891.78x = 1,337.68 × 314.66
  4. Step 4: Simplify right side
    891.78x = 420,914.39
  5. Step 5: Solve for x
    x = 420,914.39/891.78
  6. Step 6: Final answer
    x = 471.99

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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.