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Finding the Fourth Proportional to 477.50, 716.70 and 217.64

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Solution

The fourth proportional to 477.50, 716.70 and 217.64 is: 326.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    477.50 : 716.70 = 217.64 : x
  2. Step 2: Convert to fraction form
    477.50/716.70 = 217.64/x
  3. Step 3: Cross multiply
    477.50x = 716.70 × 217.64
  4. Step 4: Simplify right side
    477.50x = 155,979.94
  5. Step 5: Solve for x
    x = 155,979.94/477.50
  6. Step 6: Final answer
    x = 326.66

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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.