Home / 20,933.85-28,888.11-11,981.05

Finding the Fourth Proportional to 20,933.85, 28,888.11 and 11,981.05

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Solution

The fourth proportional to 20,933.85, 28,888.11 and 11,981.05 is: 16,533.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,933.85 : 28,888.11 = 11,981.05 : x
  2. Step 2: Convert to fraction form
    20,933.85/28,888.11 = 11,981.05/x
  3. Step 3: Cross multiply
    20,933.85x = 28,888.11 × 11,981.05
  4. Step 4: Simplify right side
    20,933.85x = 346,109,818.10
  5. Step 5: Solve for x
    x = 346,109,818.10/20,933.85
  6. Step 6: Final answer
    x = 16,533.50

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1.5x scale

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.