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Finding the Fourth Proportional to 98.88, 147.96 and 77.28

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Solution

The fourth proportional to 98.88, 147.96 and 77.28 is: 115.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    98.88 : 147.96 = 77.28 : x
  2. Step 2: Convert to fraction form
    98.88/147.96 = 77.28/x
  3. Step 3: Cross multiply
    98.88x = 147.96 × 77.28
  4. Step 4: Simplify right side
    98.88x = 11,434.35
  5. Step 5: Solve for x
    x = 11,434.35/98.88
  6. Step 6: Final answer
    x = 115.64

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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.