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Finding the Fourth Proportional to 219.31, 302.66 and 121.07

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Solution

The fourth proportional to 219.31, 302.66 and 121.07 is: 167.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    219.31 : 302.66 = 121.07 : x
  2. Step 2: Convert to fraction form
    219.31/302.66 = 121.07/x
  3. Step 3: Cross multiply
    219.31x = 302.66 × 121.07
  4. Step 4: Simplify right side
    219.31x = 36,643.05
  5. Step 5: Solve for x
    x = 36,643.05/219.31
  6. Step 6: Final answer
    x = 167.08

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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.