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Finding the Fourth Proportional to 886.80, 1,329.24 and 644.40

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Solution

The fourth proportional to 886.80, 1,329.24 and 644.40 is: 965.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    886.80 : 1,329.24 = 644.40 : x
  2. Step 2: Convert to fraction form
    886.80/1,329.24 = 644.40/x
  3. Step 3: Cross multiply
    886.80x = 1,329.24 × 644.40
  4. Step 4: Simplify right side
    886.80x = 856,562.26
  5. Step 5: Solve for x
    x = 856,562.26/886.80
  6. Step 6: Final answer
    x = 965.90

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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.