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Finding the Fourth Proportional to 101.79, 151.79 and 89.67

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Solution

The fourth proportional to 101.79, 151.79 and 89.67 is: 133.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    101.79 : 151.79 = 89.67 : x
  2. Step 2: Convert to fraction form
    101.79/151.79 = 89.67/x
  3. Step 3: Cross multiply
    101.79x = 151.79 × 89.67
  4. Step 4: Simplify right side
    101.79x = 13,611.01
  5. Step 5: Solve for x
    x = 13,611.01/101.79
  6. Step 6: Final answer
    x = 133.72

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.