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Finding the Fourth Proportional to 477.12, 715.20 and 217.18

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Solution

The fourth proportional to 477.12, 715.20 and 217.18 is: 325.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    477.12 : 715.20 = 217.18 : x
  2. Step 2: Convert to fraction form
    477.12/715.20 = 217.18/x
  3. Step 3: Cross multiply
    477.12x = 715.20 × 217.18
  4. Step 4: Simplify right side
    477.12x = 155,327.22
  5. Step 5: Solve for x
    x = 155,327.22/477.12
  6. Step 6: Final answer
    x = 325.55

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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.