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Finding the Fourth Proportional to 88.70, 122.39 and 51.85

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Solution

The fourth proportional to 88.70, 122.39 and 51.85 is: 71.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    88.70 : 122.39 = 51.85 : x
  2. Step 2: Convert to fraction form
    88.70/122.39 = 51.85/x
  3. Step 3: Cross multiply
    88.70x = 122.39 × 51.85
  4. Step 4: Simplify right side
    88.70x = 6,345.36
  5. Step 5: Solve for x
    x = 6,345.36/88.70
  6. Step 6: Final answer
    x = 71.54

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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.