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Finding the Fourth Proportional to 811.47, 1,217.11 and 234.35

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Solution

The fourth proportional to 811.47, 1,217.11 and 234.35 is: 351.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    811.47 : 1,217.11 = 234.35 : x
  2. Step 2: Convert to fraction form
    811.47/1,217.11 = 234.35/x
  3. Step 3: Cross multiply
    811.47x = 1,217.11 × 234.35
  4. Step 4: Simplify right side
    811.47x = 285,229.73
  5. Step 5: Solve for x
    x = 285,229.73/811.47
  6. Step 6: Final answer
    x = 351.50

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