Home / 20,890.38-28,829.33-11,459.55

Finding the Fourth Proportional to 20,890.38, 28,829.33 and 11,459.55

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Solution

The fourth proportional to 20,890.38, 28,829.33 and 11,459.55 is: 15,814.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,890.38 : 28,829.33 = 11,459.55 : x
  2. Step 2: Convert to fraction form
    20,890.38/28,829.33 = 11,459.55/x
  3. Step 3: Cross multiply
    20,890.38x = 28,829.33 × 11,459.55
  4. Step 4: Simplify right side
    20,890.38x = 330,371,148.60
  5. Step 5: Solve for x
    x = 330,371,148.60/20,890.38
  6. Step 6: Final answer
    x = 15,814.51

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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.