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Finding the Fourth Proportional to 100,663.80, 138,912.50 and 55,341.45

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Solution

The fourth proportional to 100,663.80, 138,912.50 and 55,341.45 is: 76,369.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,663.80 : 138,912.50 = 55,341.45 : x
  2. Step 2: Convert to fraction form
    100,663.80/138,912.50 = 55,341.45/x
  3. Step 3: Cross multiply
    100,663.80x = 138,912.50 × 55,341.45
  4. Step 4: Simplify right side
    100,663.80x = 7,687,619,190.77
  5. Step 5: Solve for x
    x = 7,687,619,190.77/100,663.80
  6. Step 6: Final answer
    x = 76,369.26

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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.