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Finding the Fourth Proportional to 317.41, 476.09 and 86.29

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Solution

The fourth proportional to 317.41, 476.09 and 86.29 is: 129.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    317.41 : 476.09 = 86.29 : x
  2. Step 2: Convert to fraction form
    317.41/476.09 = 86.29/x
  3. Step 3: Cross multiply
    317.41x = 476.09 × 86.29
  4. Step 4: Simplify right side
    317.41x = 41,081.81
  5. Step 5: Solve for x
    x = 41,081.81/317.41
  6. Step 6: Final answer
    x = 129.43

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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.