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Finding the Fourth Proportional to 75,920.80, 113,978.40 and 40,410.40

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Solution

The fourth proportional to 75,920.80, 113,978.40 and 40,410.40 is: 60,667.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    75,920.80 : 113,978.40 = 40,410.40 : x
  2. Step 2: Convert to fraction form
    75,920.80/113,978.40 = 40,410.40/x
  3. Step 3: Cross multiply
    75,920.80x = 113,978.40 × 40,410.40
  4. Step 4: Simplify right side
    75,920.80x = 4,605,912,735.36
  5. Step 5: Solve for x
    x = 4,605,912,735.36/75,920.80
  6. Step 6: Final answer
    x = 60,667.34

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.