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Finding the Fourth Proportional to 317.60, 438.28 and 177.72

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Solution

The fourth proportional to 317.60, 438.28 and 177.72 is: 245.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    317.60 : 438.28 = 177.72 : x
  2. Step 2: Convert to fraction form
    317.60/438.28 = 177.72/x
  3. Step 3: Cross multiply
    317.60x = 438.28 × 177.72
  4. Step 4: Simplify right side
    317.60x = 77,891.12
  5. Step 5: Solve for x
    x = 77,891.12/317.60
  6. Step 6: Final answer
    x = 245.25

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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.