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Finding the Fourth Proportional to 641.38, 885.24 and 379.45

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Solution

The fourth proportional to 641.38, 885.24 and 379.45 is: 523.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    641.38 : 885.24 = 379.45 : x
  2. Step 2: Convert to fraction form
    641.38/885.24 = 379.45/x
  3. Step 3: Cross multiply
    641.38x = 885.24 × 379.45
  4. Step 4: Simplify right side
    641.38x = 335,904.32
  5. Step 5: Solve for x
    x = 335,904.32/641.38
  6. Step 6: Final answer
    x = 523.72

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 (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.