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Finding the Fourth Proportional to 121.77, 181.83 and 98.69

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Solution

The fourth proportional to 121.77, 181.83 and 98.69 is: 147.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.77 : 181.83 = 98.69 : x
  2. Step 2: Convert to fraction form
    121.77/181.83 = 98.69/x
  3. Step 3: Cross multiply
    121.77x = 181.83 × 98.69
  4. Step 4: Simplify right side
    121.77x = 17,943.71
  5. Step 5: Solve for x
    x = 17,943.71/121.77
  6. Step 6: Final answer
    x = 147.36

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.