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Finding the Fourth Proportional to 239.40, 330.19 and 156.42

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Solution

The fourth proportional to 239.40, 330.19 and 156.42 is: 215.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    239.40 : 330.19 = 156.42 : x
  2. Step 2: Convert to fraction form
    239.40/330.19 = 156.42/x
  3. Step 3: Cross multiply
    239.40x = 330.19 × 156.42
  4. Step 4: Simplify right side
    239.40x = 51,648.32
  5. Step 5: Solve for x
    x = 51,648.32/239.40
  6. Step 6: Final answer
    x = 215.74

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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.