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Finding the Fourth Proportional to 75,991.20, 113,986.68 and 20,587.20

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Solution

The fourth proportional to 75,991.20, 113,986.68 and 20,587.20 is: 30,880.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    75,991.20 : 113,986.68 = 20,587.20 : x
  2. Step 2: Convert to fraction form
    75,991.20/113,986.68 = 20,587.20/x
  3. Step 3: Cross multiply
    75,991.20x = 113,986.68 × 20,587.20
  4. Step 4: Simplify right side
    75,991.20x = 2,346,666,578.50
  5. Step 5: Solve for x
    x = 2,346,666,578.50/75,991.20
  6. Step 6: Final answer
    x = 30,880.77

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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.