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Finding the Fourth Proportional to 317.61, 438.27 and 177.71

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Solution

The fourth proportional to 317.61, 438.27 and 177.71 is: 245.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    317.61 : 438.27 = 177.71 : x
  2. Step 2: Convert to fraction form
    317.61/438.27 = 177.71/x
  3. Step 3: Cross multiply
    317.61x = 438.27 × 177.71
  4. Step 4: Simplify right side
    317.61x = 77,884.96
  5. Step 5: Solve for x
    x = 77,884.96/317.61
  6. Step 6: Final answer
    x = 245.22

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.