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Finding the Fourth Proportional to 100,761.49, 139,050.84 and 55,438.48

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Solution

The fourth proportional to 100,761.49, 139,050.84 and 55,438.48 is: 76,505.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,761.49 : 139,050.84 = 55,438.48 : x
  2. Step 2: Convert to fraction form
    100,761.49/139,050.84 = 55,438.48/x
  3. Step 3: Cross multiply
    100,761.49x = 139,050.84 × 55,438.48
  4. Step 4: Simplify right side
    100,761.49x = 7,708,767,212.32
  5. Step 5: Solve for x
    x = 7,708,767,212.32/100,761.49
  6. Step 6: Final answer
    x = 76,505.09

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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.