Home / 20,890.74-28,829.18-11,459.28

Finding the Fourth Proportional to 20,890.74, 28,829.18 and 11,459.28

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Solution

The fourth proportional to 20,890.74, 28,829.18 and 11,459.28 is: 15,813.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,890.74 : 28,829.18 = 11,459.28 : x
  2. Step 2: Convert to fraction form
    20,890.74/28,829.18 = 11,459.28/x
  3. Step 3: Cross multiply
    20,890.74x = 28,829.18 × 11,459.28
  4. Step 4: Simplify right side
    20,890.74x = 330,361,645.79
  5. Step 5: Solve for x
    x = 330,361,645.79/20,890.74
  6. Step 6: Final answer
    x = 15,813.78

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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.