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Finding the Fourth Proportional to 317.79, 476.82 and 215.19

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Solution

The fourth proportional to 317.79, 476.82 and 215.19 is: 322.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    317.79 : 476.82 = 215.19 : x
  2. Step 2: Convert to fraction form
    317.79/476.82 = 215.19/x
  3. Step 3: Cross multiply
    317.79x = 476.82 × 215.19
  4. Step 4: Simplify right side
    317.79x = 102,606.90
  5. Step 5: Solve for x
    x = 102,606.90/317.79
  6. Step 6: Final answer
    x = 322.88

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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.