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Finding the Fourth Proportional to 100,627.82, 138,879.51 and 64,921.70

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Solution

The fourth proportional to 100,627.82, 138,879.51 and 64,921.70 is: 89,600.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,627.82 : 138,879.51 = 64,921.70 : x
  2. Step 2: Convert to fraction form
    100,627.82/138,879.51 = 64,921.70/x
  3. Step 3: Cross multiply
    100,627.82x = 138,879.51 × 64,921.70
  4. Step 4: Simplify right side
    100,627.82x = 9,016,294,353.29
  5. Step 5: Solve for x
    x = 9,016,294,353.29/100,627.82
  6. Step 6: Final answer
    x = 89,600.42

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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.