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Finding the Fourth Proportional to 100,761.99, 139,051.53 and 55,438.98

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Solution

The fourth proportional to 100,761.99, 139,051.53 and 55,438.98 is: 76,505.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,761.99 : 139,051.53 = 55,438.98 : x
  2. Step 2: Convert to fraction form
    100,761.99/139,051.53 = 55,438.98/x
  3. Step 3: Cross multiply
    100,761.99x = 139,051.53 × 55,438.98
  4. Step 4: Simplify right side
    100,761.99x = 7,708,874,990.64
  5. Step 5: Solve for x
    x = 7,708,874,990.64/100,761.99
  6. Step 6: Final answer
    x = 76,505.78

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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.