Home / 20,890.80-31,306.86-11,535.12

Finding the Fourth Proportional to 20,890.80, 31,306.86 and 11,535.12

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Solution

The fourth proportional to 20,890.80, 31,306.86 and 11,535.12 is: 17,286.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,890.80 : 31,306.86 = 11,535.12 : x
  2. Step 2: Convert to fraction form
    20,890.80/31,306.86 = 11,535.12/x
  3. Step 3: Cross multiply
    20,890.80x = 31,306.86 × 11,535.12
  4. Step 4: Simplify right side
    20,890.80x = 361,128,386.92
  5. Step 5: Solve for x
    x = 361,128,386.92/20,890.80
  6. Step 6: Final answer
    x = 17,286.48

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.