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Finding the Fourth Proportional to 887.12, 1,329.46 and 644.12

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Solution

The fourth proportional to 887.12, 1,329.46 and 644.12 is: 965.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    887.12 : 1,329.46 = 644.12 : x
  2. Step 2: Convert to fraction form
    887.12/1,329.46 = 644.12/x
  3. Step 3: Cross multiply
    887.12x = 1,329.46 × 644.12
  4. Step 4: Simplify right side
    887.12x = 856,331.78
  5. Step 5: Solve for x
    x = 856,331.78/887.12
  6. Step 6: Final answer
    x = 965.29

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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.