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Finding the Fourth Proportional to 891.92, 1,337.79 and 314.84

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Solution

The fourth proportional to 891.92, 1,337.79 and 314.84 is: 472.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    891.92 : 1,337.79 = 314.84 : x
  2. Step 2: Convert to fraction form
    891.92/1,337.79 = 314.84/x
  3. Step 3: Cross multiply
    891.92x = 1,337.79 × 314.84
  4. Step 4: Simplify right side
    891.92x = 421,189.80
  5. Step 5: Solve for x
    x = 421,189.80/891.92
  6. Step 6: Final answer
    x = 472.23

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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.