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Finding the Fourth Proportional to 100,290.38, 138,109.06 and 93,879.63

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Solution

The fourth proportional to 100,290.38, 138,109.06 and 93,879.63 is: 129,280.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,290.38 : 138,109.06 = 93,879.63 : x
  2. Step 2: Convert to fraction form
    100,290.38/138,109.06 = 93,879.63/x
  3. Step 3: Cross multiply
    100,290.38x = 138,109.06 × 93,879.63
  4. Step 4: Simplify right side
    100,290.38x = 12,965,627,452.45
  5. Step 5: Solve for x
    x = 12,965,627,452.45/100,290.38
  6. Step 6: Final answer
    x = 129,280.87

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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.