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Finding the Fourth Proportional to 478.10, 717.15 and 272.87

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Solution

The fourth proportional to 478.10, 717.15 and 272.87 is: 409.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    478.10 : 717.15 = 272.87 : x
  2. Step 2: Convert to fraction form
    478.10/717.15 = 272.87/x
  3. Step 3: Cross multiply
    478.10x = 717.15 × 272.87
  4. Step 4: Simplify right side
    478.10x = 195,688.85
  5. Step 5: Solve for x
    x = 195,688.85/478.10
  6. Step 6: Final answer
    x = 409.30

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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.