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Finding the Fourth Proportional to 219.47, 302.89 and 136.66

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Solution

The fourth proportional to 219.47, 302.89 and 136.66 is: 188.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    219.47 : 302.89 = 136.66 : x
  2. Step 2: Convert to fraction form
    219.47/302.89 = 136.66/x
  3. Step 3: Cross multiply
    219.47x = 302.89 × 136.66
  4. Step 4: Simplify right side
    219.47x = 41,392.95
  5. Step 5: Solve for x
    x = 41,392.95/219.47
  6. Step 6: Final answer
    x = 188.60

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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.