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Finding the Fourth Proportional to 100,531.67, 138,728.21 and 55,215.59

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Solution

The fourth proportional to 100,531.67, 138,728.21 and 55,215.59 is: 76,194.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,531.67 : 138,728.21 = 55,215.59 : x
  2. Step 2: Convert to fraction form
    100,531.67/138,728.21 = 55,215.59/x
  3. Step 3: Cross multiply
    100,531.67x = 138,728.21 × 55,215.59
  4. Step 4: Simplify right side
    100,531.67x = 7,659,958,995.07
  5. Step 5: Solve for x
    x = 7,659,958,995.07/100,531.67
  6. Step 6: Final answer
    x = 76,194.49

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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.