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Finding the Fourth Proportional to 88.72, 122.38 and 79.50

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Solution

The fourth proportional to 88.72, 122.38 and 79.50 is: 109.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    88.72 : 122.38 = 79.50 : x
  2. Step 2: Convert to fraction form
    88.72/122.38 = 79.50/x
  3. Step 3: Cross multiply
    88.72x = 122.38 × 79.50
  4. Step 4: Simplify right side
    88.72x = 9,729.21
  5. Step 5: Solve for x
    x = 9,729.21/88.72
  6. Step 6: Final answer
    x = 109.66

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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.