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Finding the Fourth Proportional to 88.13, 121.61 and 49.31

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Solution

The fourth proportional to 88.13, 121.61 and 49.31 is: 68.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    88.13 : 121.61 = 49.31 : x
  2. Step 2: Convert to fraction form
    88.13/121.61 = 49.31/x
  3. Step 3: Cross multiply
    88.13x = 121.61 × 49.31
  4. Step 4: Simplify right side
    88.13x = 5,997.02
  5. Step 5: Solve for x
    x = 5,997.02/88.13
  6. Step 6: Final answer
    x = 68.05

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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.