Home / 20,390.18-28,136.55-11,435.94

Finding the Fourth Proportional to 20,390.18, 28,136.55 and 11,435.94

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Solution

The fourth proportional to 20,390.18, 28,136.55 and 11,435.94 is: 15,780.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,390.18 : 28,136.55 = 11,435.94 : x
  2. Step 2: Convert to fraction form
    20,390.18/28,136.55 = 11,435.94/x
  3. Step 3: Cross multiply
    20,390.18x = 28,136.55 × 11,435.94
  4. Step 4: Simplify right side
    20,390.18x = 321,767,897.61
  5. Step 5: Solve for x
    x = 321,767,897.61/20,390.18
  6. Step 6: Final answer
    x = 15,780.54

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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.