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Finding the Fourth Proportional to 75,459.78, 113,189.55 and 20,055.78

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Solution

The fourth proportional to 75,459.78, 113,189.55 and 20,055.78 is: 30,083.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    75,459.78 : 113,189.55 = 20,055.78 : x
  2. Step 2: Convert to fraction form
    75,459.78/113,189.55 = 20,055.78/x
  3. Step 3: Cross multiply
    75,459.78x = 113,189.55 × 20,055.78
  4. Step 4: Simplify right side
    75,459.78x = 2,270,104,713.10
  5. Step 5: Solve for x
    x = 2,270,104,713.10/75,459.78
  6. Step 6: Final answer
    x = 30,083.64

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1.5x scale

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.