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Finding the Fourth Proportional to 155.49, 232.95 and 78.39

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Solution

The fourth proportional to 155.49, 232.95 and 78.39 is: 117.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    155.49 : 232.95 = 78.39 : x
  2. Step 2: Convert to fraction form
    155.49/232.95 = 78.39/x
  3. Step 3: Cross multiply
    155.49x = 232.95 × 78.39
  4. Step 4: Simplify right side
    155.49x = 18,260.95
  5. Step 5: Solve for x
    x = 18,260.95/155.49
  6. Step 6: Final answer
    x = 117.44

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.