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Finding the Fourth Proportional to 100,668.20, 138,923.04 and 55,346.50

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Solution

The fourth proportional to 100,668.20, 138,923.04 and 55,346.50 is: 76,378.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,668.20 : 138,923.04 = 55,346.50 : x
  2. Step 2: Convert to fraction form
    100,668.20/138,923.04 = 55,346.50/x
  3. Step 3: Cross multiply
    100,668.20x = 138,923.04 × 55,346.50
  4. Step 4: Simplify right side
    100,668.20x = 7,688,903,691.89
  5. Step 5: Solve for x
    x = 7,688,903,691.89/100,668.20
  6. Step 6: Final answer
    x = 76,378.68

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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.