Home / 20,747.40-28,631.22-11,315.76

Finding the Fourth Proportional to 20,747.40, 28,631.22 and 11,315.76

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Solution

The fourth proportional to 20,747.40, 28,631.22 and 11,315.76 is: 15,615.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,747.40 : 28,631.22 = 11,315.76 : x
  2. Step 2: Convert to fraction form
    20,747.40/28,631.22 = 11,315.76/x
  3. Step 3: Cross multiply
    20,747.40x = 28,631.22 × 11,315.76
  4. Step 4: Simplify right side
    20,747.40x = 323,984,014.03
  5. Step 5: Solve for x
    x = 323,984,014.03/20,747.40
  6. Step 6: Final answer
    x = 15,615.64

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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.