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Finding the Fourth Proportional to 478.14, 717.65 and 247.20

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Solution

The fourth proportional to 478.14, 717.65 and 247.20 is: 371.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    478.14 : 717.65 = 247.20 : x
  2. Step 2: Convert to fraction form
    478.14/717.65 = 247.20/x
  3. Step 3: Cross multiply
    478.14x = 717.65 × 247.20
  4. Step 4: Simplify right side
    478.14x = 177,403.08
  5. Step 5: Solve for x
    x = 177,403.08/478.14
  6. Step 6: Final answer
    x = 371.03

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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.