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Finding the Fourth Proportional to 126.90, 174.81 and 100.98

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Solution

The fourth proportional to 126.90, 174.81 and 100.98 is: 139.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    126.90 : 174.81 = 100.98 : x
  2. Step 2: Convert to fraction form
    126.90/174.81 = 100.98/x
  3. Step 3: Cross multiply
    126.90x = 174.81 × 100.98
  4. Step 4: Simplify right side
    126.90x = 17,652.31
  5. Step 5: Solve for x
    x = 17,652.31/126.90
  6. Step 6: Final answer
    x = 139.10

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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.