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Finding the Fourth Proportional to 100,615.50, 138,849.42 and 55,903.50

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Solution

The fourth proportional to 100,615.50, 138,849.42 and 55,903.50 is: 77,146.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,615.50 : 138,849.42 = 55,903.50 : x
  2. Step 2: Convert to fraction form
    100,615.50/138,849.42 = 55,903.50/x
  3. Step 3: Cross multiply
    100,615.50x = 138,849.42 × 55,903.50
  4. Step 4: Simplify right side
    100,615.50x = 7,762,168,550.97
  5. Step 5: Solve for x
    x = 7,762,168,550.97/100,615.50
  6. Step 6: Final answer
    x = 77,146.85

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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.