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Finding the Fourth Proportional to 478, 716.30 and 217.86

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Solution

The fourth proportional to 478, 716.30 and 217.86 is: 326.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    478 : 716.30 = 217.86 : x
  2. Step 2: Convert to fraction form
    478/716.30 = 217.86/x
  3. Step 3: Cross multiply
    478x = 716.30 × 217.86
  4. Step 4: Simplify right side
    478x = 156,053.12
  5. Step 5: Solve for x
    x = 156,053.12/478
  6. Step 6: Final answer
    x = 326.47

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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.