Home / 20,856.10-28,781.88-11,903.42

Finding the Fourth Proportional to 20,856.10, 28,781.88 and 11,903.42

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Solution

The fourth proportional to 20,856.10, 28,781.88 and 11,903.42 is: 16,426.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,856.10 : 28,781.88 = 11,903.42 : x
  2. Step 2: Convert to fraction form
    20,856.10/28,781.88 = 11,903.42/x
  3. Step 3: Cross multiply
    20,856.10x = 28,781.88 × 11,903.42
  4. Step 4: Simplify right side
    20,856.10x = 342,602,922.62
  5. Step 5: Solve for x
    x = 342,602,922.62/20,856.10
  6. Step 6: Final answer
    x = 16,426.99

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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.