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Finding the Fourth Proportional to 317.65, 438.79 and 255.72

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Solution

The fourth proportional to 317.65, 438.79 and 255.72 is: 353.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    317.65 : 438.79 = 255.72 : x
  2. Step 2: Convert to fraction form
    317.65/438.79 = 255.72/x
  3. Step 3: Cross multiply
    317.65x = 438.79 × 255.72
  4. Step 4: Simplify right side
    317.65x = 112,206.10
  5. Step 5: Solve for x
    x = 112,206.10/317.65
  6. Step 6: Final answer
    x = 353.24

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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.