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Finding the Fourth Proportional to 239.34, 330.18 and 156.45

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Solution

The fourth proportional to 239.34, 330.18 and 156.45 is: 215.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    239.34 : 330.18 = 156.45 : x
  2. Step 2: Convert to fraction form
    239.34/330.18 = 156.45/x
  3. Step 3: Cross multiply
    239.34x = 330.18 × 156.45
  4. Step 4: Simplify right side
    239.34x = 51,656.66
  5. Step 5: Solve for x
    x = 51,656.66/239.34
  6. Step 6: Final answer
    x = 215.83

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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.