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Finding the Fourth Proportional to 1,102.55, 1,520.63 and 682.61

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Solution

The fourth proportional to 1,102.55, 1,520.63 and 682.61 is: 941.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,102.55 : 1,520.63 = 682.61 : x
  2. Step 2: Convert to fraction form
    1,102.55/1,520.63 = 682.61/x
  3. Step 3: Cross multiply
    1,102.55x = 1,520.63 × 682.61
  4. Step 4: Simplify right side
    1,102.55x = 1,037,990.03
  5. Step 5: Solve for x
    x = 1,037,990.03/1,102.55
  6. Step 6: Final answer
    x = 941.44

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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.