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Finding the Fourth Proportional to 890.79, 1,337.45 and 481.38

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Solution

The fourth proportional to 890.79, 1,337.45 and 481.38 is: 722.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    890.79 : 1,337.45 = 481.38 : x
  2. Step 2: Convert to fraction form
    890.79/1,337.45 = 481.38/x
  3. Step 3: Cross multiply
    890.79x = 1,337.45 × 481.38
  4. Step 4: Simplify right side
    890.79x = 643,819.27
  5. Step 5: Solve for x
    x = 643,819.27/890.79
  6. Step 6: Final answer
    x = 722.75

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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.