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Finding the Fourth Proportional to 98.86, 136.74 and 91.98

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Solution

The fourth proportional to 98.86, 136.74 and 91.98 is: 127.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    98.86 : 136.74 = 91.98 : x
  2. Step 2: Convert to fraction form
    98.86/136.74 = 91.98/x
  3. Step 3: Cross multiply
    98.86x = 136.74 × 91.98
  4. Step 4: Simplify right side
    98.86x = 12,577.35
  5. Step 5: Solve for x
    x = 12,577.35/98.86
  6. Step 6: Final answer
    x = 127.22

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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.