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Finding the Fourth Proportional to 100,154.56, 138,215.36 and 61,919.68

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Solution

The fourth proportional to 100,154.56, 138,215.36 and 61,919.68 is: 85,450.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,154.56 : 138,215.36 = 61,919.68 : x
  2. Step 2: Convert to fraction form
    100,154.56/138,215.36 = 61,919.68/x
  3. Step 3: Cross multiply
    100,154.56x = 138,215.36 × 61,919.68
  4. Step 4: Simplify right side
    100,154.56x = 8,558,250,862.28
  5. Step 5: Solve for x
    x = 8,558,250,862.28/100,154.56
  6. Step 6: Final answer
    x = 85,450.44

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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.