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Finding the Fourth Proportional to 239.78, 330.95 and 152.43

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Solution

The fourth proportional to 239.78, 330.95 and 152.43 is: 210.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    239.78 : 330.95 = 152.43 : x
  2. Step 2: Convert to fraction form
    239.78/330.95 = 152.43/x
  3. Step 3: Cross multiply
    239.78x = 330.95 × 152.43
  4. Step 4: Simplify right side
    239.78x = 50,445.95
  5. Step 5: Solve for x
    x = 50,445.95/239.78
  6. Step 6: Final answer
    x = 210.39

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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.