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Finding the Fourth Proportional to 225.19, 310.76 and 121.69

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Solution

The fourth proportional to 225.19, 310.76 and 121.69 is: 167.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    225.19 : 310.76 = 121.69 : x
  2. Step 2: Convert to fraction form
    225.19/310.76 = 121.69/x
  3. Step 3: Cross multiply
    225.19x = 310.76 × 121.69
  4. Step 4: Simplify right side
    225.19x = 37,817.31
  5. Step 5: Solve for x
    x = 37,817.31/225.19
  6. Step 6: Final answer
    x = 167.93

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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.