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Finding the Fourth Proportional to 126.87, 174.63 and 103.40

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Solution

The fourth proportional to 126.87, 174.63 and 103.40 is: 142.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    126.87 : 174.63 = 103.40 : x
  2. Step 2: Convert to fraction form
    126.87/174.63 = 103.40/x
  3. Step 3: Cross multiply
    126.87x = 174.63 × 103.40
  4. Step 4: Simplify right side
    126.87x = 18,056.74
  5. Step 5: Solve for x
    x = 18,056.74/126.87
  6. Step 6: Final answer
    x = 142.32

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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.