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Finding the Fourth Proportional to 219.51, 302.91 and 121.26

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Solution

The fourth proportional to 219.51, 302.91 and 121.26 is: 167.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    219.51 : 302.91 = 121.26 : x
  2. Step 2: Convert to fraction form
    219.51/302.91 = 121.26/x
  3. Step 3: Cross multiply
    219.51x = 302.91 × 121.26
  4. Step 4: Simplify right side
    219.51x = 36,731.17
  5. Step 5: Solve for x
    x = 36,731.17/219.51
  6. Step 6: Final answer
    x = 167.33

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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.