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Finding the Fourth Proportional to 822.72, 1,234.08 and 438.78

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Solution

The fourth proportional to 822.72, 1,234.08 and 438.78 is: 658.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    822.72 : 1,234.08 = 438.78 : x
  2. Step 2: Convert to fraction form
    822.72/1,234.08 = 438.78/x
  3. Step 3: Cross multiply
    822.72x = 1,234.08 × 438.78
  4. Step 4: Simplify right side
    822.72x = 541,489.62
  5. Step 5: Solve for x
    x = 541,489.62/822.72
  6. Step 6: Final answer
    x = 658.17

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Double scale
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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.