Home / 1,108.12-1,661.36-669.53

Finding the Fourth Proportional to 1,108.12, 1,661.36 and 669.53

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Solution

The fourth proportional to 1,108.12, 1,661.36 and 669.53 is: 1,003.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,108.12 : 1,661.36 = 669.53 : x
  2. Step 2: Convert to fraction form
    1,108.12/1,661.36 = 669.53/x
  3. Step 3: Cross multiply
    1,108.12x = 1,661.36 × 669.53
  4. Step 4: Simplify right side
    1,108.12x = 1,112,330.36
  5. Step 5: Solve for x
    x = 1,112,330.36/1,108.12
  6. Step 6: Final answer
    x = 1,003.80

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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.