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Finding the Fourth Proportional to 966.20, 1,449.30 and 388.94

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Solution

The fourth proportional to 966.20, 1,449.30 and 388.94 is: 583.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    966.20 : 1,449.30 = 388.94 : x
  2. Step 2: Convert to fraction form
    966.20/1,449.30 = 388.94/x
  3. Step 3: Cross multiply
    966.20x = 1,449.30 × 388.94
  4. Step 4: Simplify right side
    966.20x = 563,690.74
  5. Step 5: Solve for x
    x = 563,690.74/966.20
  6. Step 6: Final answer
    x = 583.41

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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.