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Finding the Fourth Proportional to 477.15, 715.58 and 217

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Solution

The fourth proportional to 477.15, 715.58 and 217 is: 325.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    477.15 : 715.58 = 217 : x
  2. Step 2: Convert to fraction form
    477.15/715.58 = 217/x
  3. Step 3: Cross multiply
    477.15x = 715.58 × 217
  4. Step 4: Simplify right side
    477.15x = 155,280.86
  5. Step 5: Solve for x
    x = 155,280.86/477.15
  6. Step 6: Final answer
    x = 325.43

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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.