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Finding the Fourth Proportional to 91.14, 136.83 and 70.98

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Solution

The fourth proportional to 91.14, 136.83 and 70.98 is: 106.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.14 : 136.83 = 70.98 : x
  2. Step 2: Convert to fraction form
    91.14/136.83 = 70.98/x
  3. Step 3: Cross multiply
    91.14x = 136.83 × 70.98
  4. Step 4: Simplify right side
    91.14x = 9,712.19
  5. Step 5: Solve for x
    x = 9,712.19/91.14
  6. Step 6: Final answer
    x = 106.56

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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.