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Finding the Fourth Proportional to 1,102.13, 1,520.67 and 806.88

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Solution

The fourth proportional to 1,102.13, 1,520.67 and 806.88 is: 1,113.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,102.13 : 1,520.67 = 806.88 : x
  2. Step 2: Convert to fraction form
    1,102.13/1,520.67 = 806.88/x
  3. Step 3: Cross multiply
    1,102.13x = 1,520.67 × 806.88
  4. Step 4: Simplify right side
    1,102.13x = 1,226,998.21
  5. Step 5: Solve for x
    x = 1,226,998.21/1,102.13
  6. Step 6: Final answer
    x = 1,113.30

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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.