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Finding the Fourth Proportional to 478.50, 717.74 and 272.63

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Solution

The fourth proportional to 478.50, 717.74 and 272.63 is: 408.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    478.50 : 717.74 = 272.63 : x
  2. Step 2: Convert to fraction form
    478.50/717.74 = 272.63/x
  3. Step 3: Cross multiply
    478.50x = 717.74 × 272.63
  4. Step 4: Simplify right side
    478.50x = 195,672.50
  5. Step 5: Solve for x
    x = 195,672.50/478.50
  6. Step 6: Final answer
    x = 408.93

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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.