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Finding the Fourth Proportional to 317.85, 438.53 and 251.48

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Solution

The fourth proportional to 317.85, 438.53 and 251.48 is: 346.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    317.85 : 438.53 = 251.48 : x
  2. Step 2: Convert to fraction form
    317.85/438.53 = 251.48/x
  3. Step 3: Cross multiply
    317.85x = 438.53 × 251.48
  4. Step 4: Simplify right side
    317.85x = 110,281.52
  5. Step 5: Solve for x
    x = 110,281.52/317.85
  6. Step 6: Final answer
    x = 346.96

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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.