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Finding the Fourth Proportional to 1,109.10, 1,661.69 and 988.44

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Solution

The fourth proportional to 1,109.10, 1,661.69 and 988.44 is: 1,480.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,109.10 : 1,661.69 = 988.44 : x
  2. Step 2: Convert to fraction form
    1,109.10/1,661.69 = 988.44/x
  3. Step 3: Cross multiply
    1,109.10x = 1,661.69 × 988.44
  4. Step 4: Simplify right side
    1,109.10x = 1,642,480.86
  5. Step 5: Solve for x
    x = 1,642,480.86/1,109.10
  6. Step 6: Final answer
    x = 1,480.91

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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.