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Finding the Fourth Proportional to 100,690.95, 138,951.24 and 54,749.60

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Solution

The fourth proportional to 100,690.95, 138,951.24 and 54,749.60 is: 75,553.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,690.95 : 138,951.24 = 54,749.60 : x
  2. Step 2: Convert to fraction form
    100,690.95/138,951.24 = 54,749.60/x
  3. Step 3: Cross multiply
    100,690.95x = 138,951.24 × 54,749.60
  4. Step 4: Simplify right side
    100,690.95x = 7,607,524,114.75
  5. Step 5: Solve for x
    x = 7,607,524,114.75/100,690.95
  6. Step 6: Final answer
    x = 75,553.21

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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.