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Finding the Fourth Proportional to 886.55, 1,221.53 and 728.64

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Solution

The fourth proportional to 886.55, 1,221.53 and 728.64 is: 1,003.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    886.55 : 1,221.53 = 728.64 : x
  2. Step 2: Convert to fraction form
    886.55/1,221.53 = 728.64/x
  3. Step 3: Cross multiply
    886.55x = 1,221.53 × 728.64
  4. Step 4: Simplify right side
    886.55x = 890,051.98
  5. Step 5: Solve for x
    x = 890,051.98/886.55
  6. Step 6: Final answer
    x = 1,003.96

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.