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Finding the Fourth Proportional to 746.65, 1,120.16 and 438.76

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Solution

The fourth proportional to 746.65, 1,120.16 and 438.76 is: 658.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    746.65 : 1,120.16 = 438.76 : x
  2. Step 2: Convert to fraction form
    746.65/1,120.16 = 438.76/x
  3. Step 3: Cross multiply
    746.65x = 1,120.16 × 438.76
  4. Step 4: Simplify right side
    746.65x = 491,483.90
  5. Step 5: Solve for x
    x = 491,483.90/746.65
  6. Step 6: Final answer
    x = 658.25

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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.