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Finding the Fourth Proportional to 138.66, 191.48 and 89.63

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Solution

The fourth proportional to 138.66, 191.48 and 89.63 is: 123.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    138.66 : 191.48 = 89.63 : x
  2. Step 2: Convert to fraction form
    138.66/191.48 = 89.63/x
  3. Step 3: Cross multiply
    138.66x = 191.48 × 89.63
  4. Step 4: Simplify right side
    138.66x = 17,161.40
  5. Step 5: Solve for x
    x = 17,161.40/138.66
  6. Step 6: Final answer
    x = 123.77

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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.