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Finding the Fourth Proportional to 1,102.15, 1,520.31 and 659.80

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Solution

The fourth proportional to 1,102.15, 1,520.31 and 659.80 is: 910.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,102.15 : 1,520.31 = 659.80 : x
  2. Step 2: Convert to fraction form
    1,102.15/1,520.31 = 659.80/x
  3. Step 3: Cross multiply
    1,102.15x = 1,520.31 × 659.80
  4. Step 4: Simplify right side
    1,102.15x = 1,003,100.54
  5. Step 5: Solve for x
    x = 1,003,100.54/1,102.15
  6. Step 6: Final answer
    x = 910.13

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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.