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Finding the Fourth Proportional to 744.32, 1,113.21 and 662.58

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Solution

The fourth proportional to 744.32, 1,113.21 and 662.58 is: 990.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    744.32 : 1,113.21 = 662.58 : x
  2. Step 2: Convert to fraction form
    744.32/1,113.21 = 662.58/x
  3. Step 3: Cross multiply
    744.32x = 1,113.21 × 662.58
  4. Step 4: Simplify right side
    744.32x = 737,590.68
  5. Step 5: Solve for x
    x = 737,590.68/744.32
  6. Step 6: Final answer
    x = 990.96

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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.