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Finding the Fourth Proportional to 155.95, 215.19 and 93.78

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Solution

The fourth proportional to 155.95, 215.19 and 93.78 is: 129.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    155.95 : 215.19 = 93.78 : x
  2. Step 2: Convert to fraction form
    155.95/215.19 = 93.78/x
  3. Step 3: Cross multiply
    155.95x = 215.19 × 93.78
  4. Step 4: Simplify right side
    155.95x = 20,180.52
  5. Step 5: Solve for x
    x = 20,180.52/155.95
  6. Step 6: Final answer
    x = 129.40

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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.