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Finding the Fourth Proportional to 100,112.16, 138,153.56 and 54,789.68

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Solution

The fourth proportional to 100,112.16, 138,153.56 and 54,789.68 is: 75,609.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,112.16 : 138,153.56 = 54,789.68 : x
  2. Step 2: Convert to fraction form
    100,112.16/138,153.56 = 54,789.68/x
  3. Step 3: Cross multiply
    100,112.16x = 138,153.56 × 54,789.68
  4. Step 4: Simplify right side
    100,112.16x = 7,569,389,343.26
  5. Step 5: Solve for x
    x = 7,569,389,343.26/100,112.16
  6. Step 6: Final answer
    x = 75,609.09

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1.5x scale

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.