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Finding the Fourth Proportional to 966.54, 1,449.91 and 418.78

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Solution

The fourth proportional to 966.54, 1,449.91 and 418.78 is: 628.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    966.54 : 1,449.91 = 418.78 : x
  2. Step 2: Convert to fraction form
    966.54/1,449.91 = 418.78/x
  3. Step 3: Cross multiply
    966.54x = 1,449.91 × 418.78
  4. Step 4: Simplify right side
    966.54x = 607,186.06
  5. Step 5: Solve for x
    x = 607,186.06/966.54
  6. Step 6: Final answer
    x = 628.21

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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.