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Finding the Fourth Proportional to 518.32, 777.78 and 478.22

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Solution

The fourth proportional to 518.32, 777.78 and 478.22 is: 717.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    518.32 : 777.78 = 478.22 : x
  2. Step 2: Convert to fraction form
    518.32/777.78 = 478.22/x
  3. Step 3: Cross multiply
    518.32x = 777.78 × 478.22
  4. Step 4: Simplify right side
    518.32x = 371,951.90
  5. Step 5: Solve for x
    x = 371,951.90/518.32
  6. Step 6: Final answer
    x = 717.61

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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.