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Finding the Fourth Proportional to 135,351.85, 186,783.29 and 74,921.20

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Solution

The fourth proportional to 135,351.85, 186,783.29 and 74,921.20 is: 103,390.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    135,351.85 : 186,783.29 = 74,921.20 : x
  2. Step 2: Convert to fraction form
    135,351.85/186,783.29 = 74,921.20/x
  3. Step 3: Cross multiply
    135,351.85x = 186,783.29 × 74,921.20
  4. Step 4: Simplify right side
    135,351.85x = 13,994,027,947.09
  5. Step 5: Solve for x
    x = 13,994,027,947.09/135,351.85
  6. Step 6: Final answer
    x = 103,390.00

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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.