Home / 1,109.90-1,666.20-1,101.80

Finding the Fourth Proportional to 1,109.90, 1,666.20 and 1,101.80

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Solution

The fourth proportional to 1,109.90, 1,666.20 and 1,101.80 is: 1,654.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,109.90 : 1,666.20 = 1,101.80 : x
  2. Step 2: Convert to fraction form
    1,109.90/1,666.20 = 1,101.80/x
  3. Step 3: Cross multiply
    1,109.90x = 1,666.20 × 1,101.80
  4. Step 4: Simplify right side
    1,109.90x = 1,835,819.16
  5. Step 5: Solve for x
    x = 1,835,819.16/1,109.90
  6. Step 6: Final answer
    x = 1,654.04

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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.