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Finding the Fourth Proportional to 966.79, 1,449.87 and 418.63

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Solution

The fourth proportional to 966.79, 1,449.87 and 418.63 is: 627.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    966.79 : 1,449.87 = 418.63 : x
  2. Step 2: Convert to fraction form
    966.79/1,449.87 = 418.63/x
  3. Step 3: Cross multiply
    966.79x = 1,449.87 × 418.63
  4. Step 4: Simplify right side
    966.79x = 606,959.08
  5. Step 5: Solve for x
    x = 606,959.08/966.79
  6. Step 6: Final answer
    x = 627.81

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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.