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Finding the Fourth Proportional to 892.78, 1,339.18 and 315.66

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Solution

The fourth proportional to 892.78, 1,339.18 and 315.66 is: 473.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    892.78 : 1,339.18 = 315.66 : x
  2. Step 2: Convert to fraction form
    892.78/1,339.18 = 315.66/x
  3. Step 3: Cross multiply
    892.78x = 1,339.18 × 315.66
  4. Step 4: Simplify right side
    892.78x = 422,725.56
  5. Step 5: Solve for x
    x = 422,725.56/892.78
  6. Step 6: Final answer
    x = 473.49

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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.