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Finding the Fourth Proportional to 219.35, 302.70 and 121.10

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Solution

The fourth proportional to 219.35, 302.70 and 121.10 is: 167.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    219.35 : 302.70 = 121.10 : x
  2. Step 2: Convert to fraction form
    219.35/302.70 = 121.10/x
  3. Step 3: Cross multiply
    219.35x = 302.70 × 121.10
  4. Step 4: Simplify right side
    219.35x = 36,655.46
  5. Step 5: Solve for x
    x = 36,655.46/219.35
  6. Step 6: Final answer
    x = 167.11

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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.