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Finding the Fourth Proportional to 100,326.70, 138,450.81 and 55,003.71

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Solution

The fourth proportional to 100,326.70, 138,450.81 and 55,003.71 is: 75,905.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,326.70 : 138,450.81 = 55,003.71 : x
  2. Step 2: Convert to fraction form
    100,326.70/138,450.81 = 55,003.71/x
  3. Step 3: Cross multiply
    100,326.70x = 138,450.81 × 55,003.71
  4. Step 4: Simplify right side
    100,326.70x = 7,615,308,202.51
  5. Step 5: Solve for x
    x = 7,615,308,202.51/100,326.70
  6. Step 6: Final answer
    x = 75,905.10

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1.5x scale

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.