Home / 1,109.55-1,664.19-379.20

Finding the Fourth Proportional to 1,109.55, 1,664.19 and 379.20

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Solution

The fourth proportional to 1,109.55, 1,664.19 and 379.20 is: 568.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,109.55 : 1,664.19 = 379.20 : x
  2. Step 2: Convert to fraction form
    1,109.55/1,664.19 = 379.20/x
  3. Step 3: Cross multiply
    1,109.55x = 1,664.19 × 379.20
  4. Step 4: Simplify right side
    1,109.55x = 631,060.85
  5. Step 5: Solve for x
    x = 631,060.85/1,109.55
  6. Step 6: Final answer
    x = 568.75

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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.