Home / 20,388.81-28,136.40-11,436.29

Finding the Fourth Proportional to 20,388.81, 28,136.40 and 11,436.29

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Solution

The fourth proportional to 20,388.81, 28,136.40 and 11,436.29 is: 15,781.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,388.81 : 28,136.40 = 11,436.29 : x
  2. Step 2: Convert to fraction form
    20,388.81/28,136.40 = 11,436.29/x
  3. Step 3: Cross multiply
    20,388.81x = 28,136.40 × 11,436.29
  4. Step 4: Simplify right side
    20,388.81x = 321,775,951.90
  5. Step 5: Solve for x
    x = 321,775,951.90/20,388.81
  6. Step 6: Final answer
    x = 15,781.98

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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.