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Finding the Fourth Proportional to 477.39, 715.68 and 217.30

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Solution

The fourth proportional to 477.39, 715.68 and 217.30 is: 325.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    477.39 : 715.68 = 217.30 : x
  2. Step 2: Convert to fraction form
    477.39/715.68 = 217.30/x
  3. Step 3: Cross multiply
    477.39x = 715.68 × 217.30
  4. Step 4: Simplify right side
    477.39x = 155,516.66
  5. Step 5: Solve for x
    x = 155,516.66/477.39
  6. Step 6: Final answer
    x = 325.76

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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.