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Finding the Fourth Proportional to 478.35, 717.56 and 247.09

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Solution

The fourth proportional to 478.35, 717.56 and 247.09 is: 370.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    478.35 : 717.56 = 247.09 : x
  2. Step 2: Convert to fraction form
    478.35/717.56 = 247.09/x
  3. Step 3: Cross multiply
    478.35x = 717.56 × 247.09
  4. Step 4: Simplify right side
    478.35x = 177,301.56
  5. Step 5: Solve for x
    x = 177,301.56/478.35
  6. Step 6: Final answer
    x = 370.66

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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.