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Finding the Fourth Proportional to 216.34, 298.65 and 138.76

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Solution

The fourth proportional to 216.34, 298.65 and 138.76 is: 191.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    216.34 : 298.65 = 138.76 : x
  2. Step 2: Convert to fraction form
    216.34/298.65 = 138.76/x
  3. Step 3: Cross multiply
    216.34x = 298.65 × 138.76
  4. Step 4: Simplify right side
    216.34x = 41,440.67
  5. Step 5: Solve for x
    x = 41,440.67/216.34
  6. Step 6: Final answer
    x = 191.55

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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.