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Finding the Fourth Proportional to 100,423.66, 138,584.58 and 55,101.91

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Solution

The fourth proportional to 100,423.66, 138,584.58 and 55,101.91 is: 76,040.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,423.66 : 138,584.58 = 55,101.91 : x
  2. Step 2: Convert to fraction form
    100,423.66/138,584.58 = 55,101.91/x
  3. Step 3: Cross multiply
    100,423.66x = 138,584.58 × 55,101.91
  4. Step 4: Simplify right side
    100,423.66x = 7,636,275,054.55
  5. Step 5: Solve for x
    x = 7,636,275,054.55/100,423.66
  6. Step 6: Final answer
    x = 76,040.60

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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.