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Finding the Fourth Proportional to 766.20, 1,149.30 and 644.70

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Solution

The fourth proportional to 766.20, 1,149.30 and 644.70 is: 967.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    766.20 : 1,149.30 = 644.70 : x
  2. Step 2: Convert to fraction form
    766.20/1,149.30 = 644.70/x
  3. Step 3: Cross multiply
    766.20x = 1,149.30 × 644.70
  4. Step 4: Simplify right side
    766.20x = 740,953.71
  5. Step 5: Solve for x
    x = 740,953.71/766.20
  6. Step 6: Final answer
    x = 967.05

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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.