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Finding the Fourth Proportional to 100,443.78, 138,611.13 and 55,122.18

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Solution

The fourth proportional to 100,443.78, 138,611.13 and 55,122.18 is: 76,067.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,443.78 : 138,611.13 = 55,122.18 : x
  2. Step 2: Convert to fraction form
    100,443.78/138,611.13 = 55,122.18/x
  3. Step 3: Cross multiply
    100,443.78x = 138,611.13 × 55,122.18
  4. Step 4: Simplify right side
    100,443.78x = 7,640,547,657.86
  5. Step 5: Solve for x
    x = 7,640,547,657.86/100,443.78
  6. Step 6: Final answer
    x = 76,067.90

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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.