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Finding the Fourth Proportional to 88.05, 121.52 and 61.81

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Solution

The fourth proportional to 88.05, 121.52 and 61.81 is: 85.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    88.05 : 121.52 = 61.81 : x
  2. Step 2: Convert to fraction form
    88.05/121.52 = 61.81/x
  3. Step 3: Cross multiply
    88.05x = 121.52 × 61.81
  4. Step 4: Simplify right side
    88.05x = 7,511.15
  5. Step 5: Solve for x
    x = 7,511.15/88.05
  6. Step 6: Final answer
    x = 85.31

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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.