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Finding the Fourth Proportional to 966.66, 1,449.90 and 389.10

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Solution

The fourth proportional to 966.66, 1,449.90 and 389.10 is: 583.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    966.66 : 1,449.90 = 389.10 : x
  2. Step 2: Convert to fraction form
    966.66/1,449.90 = 389.10/x
  3. Step 3: Cross multiply
    966.66x = 1,449.90 × 389.10
  4. Step 4: Simplify right side
    966.66x = 564,156.09
  5. Step 5: Solve for x
    x = 564,156.09/966.66
  6. Step 6: Final answer
    x = 583.61

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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.