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Finding the Fourth Proportional to 478.08, 716.50 and 217.99

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Solution

The fourth proportional to 478.08, 716.50 and 217.99 is: 326.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    478.08 : 716.50 = 217.99 : x
  2. Step 2: Convert to fraction form
    478.08/716.50 = 217.99/x
  3. Step 3: Cross multiply
    478.08x = 716.50 × 217.99
  4. Step 4: Simplify right side
    478.08x = 156,189.84
  5. Step 5: Solve for x
    x = 156,189.84/478.08
  6. Step 6: Final answer
    x = 326.70

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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.