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Finding the Fourth Proportional to 728.55, 1,087.18 and 704.88

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Solution

The fourth proportional to 728.55, 1,087.18 and 704.88 is: 1,051.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    728.55 : 1,087.18 = 704.88 : x
  2. Step 2: Convert to fraction form
    728.55/1,087.18 = 704.88/x
  3. Step 3: Cross multiply
    728.55x = 1,087.18 × 704.88
  4. Step 4: Simplify right side
    728.55x = 766,331.44
  5. Step 5: Solve for x
    x = 766,331.44/728.55
  6. Step 6: Final answer
    x = 1,051.86

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.