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Finding the Fourth Proportional to 891.30, 1,337.31 and 479.94

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Solution

The fourth proportional to 891.30, 1,337.31 and 479.94 is: 720.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    891.30 : 1,337.31 = 479.94 : x
  2. Step 2: Convert to fraction form
    891.30/1,337.31 = 479.94/x
  3. Step 3: Cross multiply
    891.30x = 1,337.31 × 479.94
  4. Step 4: Simplify right side
    891.30x = 641,828.56
  5. Step 5: Solve for x
    x = 641,828.56/891.30
  6. Step 6: Final answer
    x = 720.10

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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.