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Finding the Fourth Proportional to 100,635.84, 138,879.82 and 55,313.46

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Solution

The fourth proportional to 100,635.84, 138,879.82 and 55,313.46 is: 76,333.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,635.84 : 138,879.82 = 55,313.46 : x
  2. Step 2: Convert to fraction form
    100,635.84/138,879.82 = 55,313.46/x
  3. Step 3: Cross multiply
    100,635.84x = 138,879.82 × 55,313.46
  4. Step 4: Simplify right side
    100,635.84x = 7,681,923,368.38
  5. Step 5: Solve for x
    x = 7,681,923,368.38/100,635.84
  6. Step 6: Final answer
    x = 76,333.87

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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.