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Finding the Fourth Proportional to 88.75, 122.45 and 51.90

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Solution

The fourth proportional to 88.75, 122.45 and 51.90 is: 71.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    88.75 : 122.45 = 51.90 : x
  2. Step 2: Convert to fraction form
    88.75/122.45 = 51.90/x
  3. Step 3: Cross multiply
    88.75x = 122.45 × 51.90
  4. Step 4: Simplify right side
    88.75x = 6,355.16
  5. Step 5: Solve for x
    x = 6,355.16/88.75
  6. Step 6: Final answer
    x = 71.61

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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.