Home / 1,108.71-1,525.45-1,081.38

Finding the Fourth Proportional to 1,108.71, 1,525.45 and 1,081.38

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Solution

The fourth proportional to 1,108.71, 1,525.45 and 1,081.38 is: 1,487.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,108.71 : 1,525.45 = 1,081.38 : x
  2. Step 2: Convert to fraction form
    1,108.71/1,525.45 = 1,081.38/x
  3. Step 3: Cross multiply
    1,108.71x = 1,525.45 × 1,081.38
  4. Step 4: Simplify right side
    1,108.71x = 1,649,591.12
  5. Step 5: Solve for x
    x = 1,649,591.12/1,108.71
  6. Step 6: Final answer
    x = 1,487.85

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Half scale
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Double scale
Find fourth proportional to 1,109.71, 1,526.83 and 1,082.38
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.