Home / 1,111.45-1,667.40-381.10

Finding the Fourth Proportional to 1,111.45, 1,667.40 and 381.10

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Solution

The fourth proportional to 1,111.45, 1,667.40 and 381.10 is: 571.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,111.45 : 1,667.40 = 381.10 : x
  2. Step 2: Convert to fraction form
    1,111.45/1,667.40 = 381.10/x
  3. Step 3: Cross multiply
    1,111.45x = 1,667.40 × 381.10
  4. Step 4: Simplify right side
    1,111.45x = 635,446.14
  5. Step 5: Solve for x
    x = 635,446.14/1,111.45
  6. Step 6: Final answer
    x = 571.73

Related Problems

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Half scale
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Double scale
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Similar ratio
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1.5x scale

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.