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Finding the Fourth Proportional to 1,108.32, 1,659.36 and 690.56

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Solution

The fourth proportional to 1,108.32, 1,659.36 and 690.56 is: 1,033.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,108.32 : 1,659.36 = 690.56 : x
  2. Step 2: Convert to fraction form
    1,108.32/1,659.36 = 690.56/x
  3. Step 3: Cross multiply
    1,108.32x = 1,659.36 × 690.56
  4. Step 4: Simplify right side
    1,108.32x = 1,145,887.64
  5. Step 5: Solve for x
    x = 1,145,887.64/1,108.32
  6. Step 6: Final answer
    x = 1,033.90

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.