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Finding the Fourth Proportional to 100,345.70, 138,363.57 and 63,998.54

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Solution

The fourth proportional to 100,345.70, 138,363.57 and 63,998.54 is: 88,245.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,345.70 : 138,363.57 = 63,998.54 : x
  2. Step 2: Convert to fraction form
    100,345.70/138,363.57 = 63,998.54/x
  3. Step 3: Cross multiply
    100,345.70x = 138,363.57 × 63,998.54
  4. Step 4: Simplify right side
    100,345.70x = 8,855,065,777.37
  5. Step 5: Solve for x
    x = 8,855,065,777.37/100,345.70
  6. Step 6: Final answer
    x = 88,245.59

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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.