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Finding the Fourth Proportional to 966.66, 1,449.10 and 389.94

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Solution

The fourth proportional to 966.66, 1,449.10 and 389.94 is: 584.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    966.66 : 1,449.10 = 389.94 : x
  2. Step 2: Convert to fraction form
    966.66/1,449.10 = 389.94/x
  3. Step 3: Cross multiply
    966.66x = 1,449.10 × 389.94
  4. Step 4: Simplify right side
    966.66x = 565,062.05
  5. Step 5: Solve for x
    x = 565,062.05/966.66
  6. Step 6: Final answer
    x = 584.55

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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.