Home / 20,890.88-28,828.92-11,459.36

Finding the Fourth Proportional to 20,890.88, 28,828.92 and 11,459.36

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Solution

The fourth proportional to 20,890.88, 28,828.92 and 11,459.36 is: 15,813.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,890.88 : 28,828.92 = 11,459.36 : x
  2. Step 2: Convert to fraction form
    20,890.88/28,828.92 = 11,459.36/x
  3. Step 3: Cross multiply
    20,890.88x = 28,828.92 × 11,459.36
  4. Step 4: Simplify right side
    20,890.88x = 330,360,972.69
  5. Step 5: Solve for x
    x = 330,360,972.69/20,890.88
  6. Step 6: Final answer
    x = 15,813.65

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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.