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Finding the Fourth Proportional to 98.30, 135.68 and 79.86

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Solution

The fourth proportional to 98.30, 135.68 and 79.86 is: 110.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    98.30 : 135.68 = 79.86 : x
  2. Step 2: Convert to fraction form
    98.30/135.68 = 79.86/x
  3. Step 3: Cross multiply
    98.30x = 135.68 × 79.86
  4. Step 4: Simplify right side
    98.30x = 10,835.40
  5. Step 5: Solve for x
    x = 10,835.40/98.30
  6. Step 6: Final answer
    x = 110.23

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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.