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Finding the Fourth Proportional to 138,419.01, 191,018.12 and 74,756.79

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Solution

The fourth proportional to 138,419.01, 191,018.12 and 74,756.79 is: 103,164.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,419.01 : 191,018.12 = 74,756.79 : x
  2. Step 2: Convert to fraction form
    138,419.01/191,018.12 = 74,756.79/x
  3. Step 3: Cross multiply
    138,419.01x = 191,018.12 × 74,756.79
  4. Step 4: Simplify right side
    138,419.01x = 14,279,901,109.25
  5. Step 5: Solve for x
    x = 14,279,901,109.25/138,419.01
  6. Step 6: Final answer
    x = 103,164.31

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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.