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Finding the Fourth Proportional to 886.80, 1,329.12 and 642.72

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Solution

The fourth proportional to 886.80, 1,329.12 and 642.72 is: 963.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    886.80 : 1,329.12 = 642.72 : x
  2. Step 2: Convert to fraction form
    886.80/1,329.12 = 642.72/x
  3. Step 3: Cross multiply
    886.80x = 1,329.12 × 642.72
  4. Step 4: Simplify right side
    886.80x = 854,252.01
  5. Step 5: Solve for x
    x = 854,252.01/886.80
  6. Step 6: Final answer
    x = 963.30

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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.