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Finding the Fourth Proportional to 317.47, 476.21 and 86.36

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Solution

The fourth proportional to 317.47, 476.21 and 86.36 is: 129.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    317.47 : 476.21 = 86.36 : x
  2. Step 2: Convert to fraction form
    317.47/476.21 = 86.36/x
  3. Step 3: Cross multiply
    317.47x = 476.21 × 86.36
  4. Step 4: Simplify right side
    317.47x = 41,125.50
  5. Step 5: Solve for x
    x = 41,125.50/317.47
  6. Step 6: Final answer
    x = 129.54

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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.