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Finding the Fourth Proportional to 100,622.56, 138,876.24 and 58,206.88

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Solution

The fourth proportional to 100,622.56, 138,876.24 and 58,206.88 is: 80,335.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,622.56 : 138,876.24 = 58,206.88 : x
  2. Step 2: Convert to fraction form
    100,622.56/138,876.24 = 58,206.88/x
  3. Step 3: Cross multiply
    100,622.56x = 138,876.24 × 58,206.88
  4. Step 4: Simplify right side
    100,622.56x = 8,083,552,636.53
  5. Step 5: Solve for x
    x = 8,083,552,636.53/100,622.56
  6. Step 6: Final answer
    x = 80,335.39

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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.