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Finding the Fourth Proportional to 98.16, 135.36 and 79.72

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Solution

The fourth proportional to 98.16, 135.36 and 79.72 is: 109.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    98.16 : 135.36 = 79.72 : x
  2. Step 2: Convert to fraction form
    98.16/135.36 = 79.72/x
  3. Step 3: Cross multiply
    98.16x = 135.36 × 79.72
  4. Step 4: Simplify right side
    98.16x = 10,790.90
  5. Step 5: Solve for x
    x = 10,790.90/98.16
  6. Step 6: Final answer
    x = 109.93

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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.