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Finding the Fourth Proportional to 155.98, 215.28 and 97.78

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Solution

The fourth proportional to 155.98, 215.28 and 97.78 is: 134.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    155.98 : 215.28 = 97.78 : x
  2. Step 2: Convert to fraction form
    155.98/215.28 = 97.78/x
  3. Step 3: Cross multiply
    155.98x = 215.28 × 97.78
  4. Step 4: Simplify right side
    155.98x = 21,050.08
  5. Step 5: Solve for x
    x = 21,050.08/155.98
  6. Step 6: Final answer
    x = 134.95

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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.