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Finding the Fourth Proportional to 478.68, 718.11 and 331.05

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Solution

The fourth proportional to 478.68, 718.11 and 331.05 is: 496.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    478.68 : 718.11 = 331.05 : x
  2. Step 2: Convert to fraction form
    478.68/718.11 = 331.05/x
  3. Step 3: Cross multiply
    478.68x = 718.11 × 331.05
  4. Step 4: Simplify right side
    478.68x = 237,733.01
  5. Step 5: Solve for x
    x = 237,733.01/478.68
  6. Step 6: Final answer
    x = 496.65

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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.