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Finding the Fourth Proportional to 1,102.59, 1,520.21 and 728.73

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Solution

The fourth proportional to 1,102.59, 1,520.21 and 728.73 is: 1,004.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,102.59 : 1,520.21 = 728.73 : x
  2. Step 2: Convert to fraction form
    1,102.59/1,520.21 = 728.73/x
  3. Step 3: Cross multiply
    1,102.59x = 1,520.21 × 728.73
  4. Step 4: Simplify right side
    1,102.59x = 1,107,818.99
  5. Step 5: Solve for x
    x = 1,107,818.99/1,102.59
  6. Step 6: Final answer
    x = 1,004.74

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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.