Home / 20,747.68-28,630.80-11,315.68

Finding the Fourth Proportional to 20,747.68, 28,630.80 and 11,315.68

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Solution

The fourth proportional to 20,747.68, 28,630.80 and 11,315.68 is: 15,615.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,747.68 : 28,630.80 = 11,315.68 : x
  2. Step 2: Convert to fraction form
    20,747.68/28,630.80 = 11,315.68/x
  3. Step 3: Cross multiply
    20,747.68x = 28,630.80 × 11,315.68
  4. Step 4: Simplify right side
    20,747.68x = 323,976,970.94
  5. Step 5: Solve for x
    x = 323,976,970.94/20,747.68
  6. Step 6: Final answer
    x = 15,615.09

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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.