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Finding the Fourth Proportional to 478.75, 718.78 and 247.81

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Solution

The fourth proportional to 478.75, 718.78 and 247.81 is: 372.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    478.75 : 718.78 = 247.81 : x
  2. Step 2: Convert to fraction form
    478.75/718.78 = 247.81/x
  3. Step 3: Cross multiply
    478.75x = 718.78 × 247.81
  4. Step 4: Simplify right side
    478.75x = 178,120.87
  5. Step 5: Solve for x
    x = 178,120.87/478.75
  6. Step 6: Final answer
    x = 372.05

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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.