Home / 20,390.94-28,136.97-11,437.20

Finding the Fourth Proportional to 20,390.94, 28,136.97 and 11,437.20

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Solution

The fourth proportional to 20,390.94, 28,136.97 and 11,437.20 is: 15,781.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,390.94 : 28,136.97 = 11,437.20 : x
  2. Step 2: Convert to fraction form
    20,390.94/28,136.97 = 11,437.20/x
  3. Step 3: Cross multiply
    20,390.94x = 28,136.97 × 11,437.20
  4. Step 4: Simplify right side
    20,390.94x = 321,808,153.28
  5. Step 5: Solve for x
    x = 321,808,153.28/20,390.94
  6. Step 6: Final answer
    x = 15,781.92

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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.