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Finding the Fourth Proportional to 317.50, 438.17 and 177.65

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Solution

The fourth proportional to 317.50, 438.17 and 177.65 is: 245.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    317.50 : 438.17 = 177.65 : x
  2. Step 2: Convert to fraction form
    317.50/438.17 = 177.65/x
  3. Step 3: Cross multiply
    317.50x = 438.17 × 177.65
  4. Step 4: Simplify right side
    317.50x = 77,840.90
  5. Step 5: Solve for x
    x = 77,840.90/317.50
  6. Step 6: Final answer
    x = 245.17

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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.