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Finding the Fourth Proportional to 138.60, 191.26 and 103.63

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Solution

The fourth proportional to 138.60, 191.26 and 103.63 is: 143.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    138.60 : 191.26 = 103.63 : x
  2. Step 2: Convert to fraction form
    138.60/191.26 = 103.63/x
  3. Step 3: Cross multiply
    138.60x = 191.26 × 103.63
  4. Step 4: Simplify right side
    138.60x = 19,820.27
  5. Step 5: Solve for x
    x = 19,820.27/138.60
  6. Step 6: Final answer
    x = 143.00

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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.