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Finding the Fourth Proportional to 312.66, 431.60 and 239.36

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Solution

The fourth proportional to 312.66, 431.60 and 239.36 is: 330.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.66 : 431.60 = 239.36 : x
  2. Step 2: Convert to fraction form
    312.66/431.60 = 239.36/x
  3. Step 3: Cross multiply
    312.66x = 431.60 × 239.36
  4. Step 4: Simplify right side
    312.66x = 103,304.42
  5. Step 5: Solve for x
    x = 103,304.42/312.66
  6. Step 6: Final answer
    x = 330.40

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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.