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Finding the Fourth Proportional to 477.90, 716.78 and 217.89

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Solution

The fourth proportional to 477.90, 716.78 and 217.89 is: 326.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    477.90 : 716.78 = 217.89 : x
  2. Step 2: Convert to fraction form
    477.90/716.78 = 217.89/x
  3. Step 3: Cross multiply
    477.90x = 716.78 × 217.89
  4. Step 4: Simplify right side
    477.90x = 156,179.74
  5. Step 5: Solve for x
    x = 156,179.74/477.90
  6. Step 6: Final answer
    x = 326.80

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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.