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Finding the Fourth Proportional to 317.98, 438.50 and 239.48

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Solution

The fourth proportional to 317.98, 438.50 and 239.48 is: 330.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    317.98 : 438.50 = 239.48 : x
  2. Step 2: Convert to fraction form
    317.98/438.50 = 239.48/x
  3. Step 3: Cross multiply
    317.98x = 438.50 × 239.48
  4. Step 4: Simplify right side
    317.98x = 105,011.88
  5. Step 5: Solve for x
    x = 105,011.88/317.98
  6. Step 6: Final answer
    x = 330.25

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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.