Home / 20,853.81-28,778.27-11,422.53

Finding the Fourth Proportional to 20,853.81, 28,778.27 and 11,422.53

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Solution

The fourth proportional to 20,853.81, 28,778.27 and 11,422.53 is: 15,763.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,853.81 : 28,778.27 = 11,422.53 : x
  2. Step 2: Convert to fraction form
    20,853.81/28,778.27 = 11,422.53/x
  3. Step 3: Cross multiply
    20,853.81x = 28,778.27 × 11,422.53
  4. Step 4: Simplify right side
    20,853.81x = 328,720,652.42
  5. Step 5: Solve for x
    x = 328,720,652.42/20,853.81
  6. Step 6: Final answer
    x = 15,763.10

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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.