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Finding the Fourth Proportional to 887.88, 1,331.80 and 644.88

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Solution

The fourth proportional to 887.88, 1,331.80 and 644.88 is: 967.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    887.88 : 1,331.80 = 644.88 : x
  2. Step 2: Convert to fraction form
    887.88/1,331.80 = 644.88/x
  3. Step 3: Cross multiply
    887.88x = 1,331.80 × 644.88
  4. Step 4: Simplify right side
    887.88x = 858,851.18
  5. Step 5: Solve for x
    x = 858,851.18/887.88
  6. Step 6: Final answer
    x = 967.31

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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.