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Finding the Fourth Proportional to 574.38, 861.70 and 189.63

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Solution

The fourth proportional to 574.38, 861.70 and 189.63 is: 284.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    574.38 : 861.70 = 189.63 : x
  2. Step 2: Convert to fraction form
    574.38/861.70 = 189.63/x
  3. Step 3: Cross multiply
    574.38x = 861.70 × 189.63
  4. Step 4: Simplify right side
    574.38x = 163,404.17
  5. Step 5: Solve for x
    x = 163,404.17/574.38
  6. Step 6: Final answer
    x = 284.49

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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.