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Finding the Fourth Proportional to 874.82, 1,312.23 and 326.86

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Solution

The fourth proportional to 874.82, 1,312.23 and 326.86 is: 490.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    874.82 : 1,312.23 = 326.86 : x
  2. Step 2: Convert to fraction form
    874.82/1,312.23 = 326.86/x
  3. Step 3: Cross multiply
    874.82x = 1,312.23 × 326.86
  4. Step 4: Simplify right side
    874.82x = 428,915.50
  5. Step 5: Solve for x
    x = 428,915.50/874.82
  6. Step 6: Final answer
    x = 490.29

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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.