Home / 20,415.20-28,170.88-11,463.69

Finding the Fourth Proportional to 20,415.20, 28,170.88 and 11,463.69

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Solution

The fourth proportional to 20,415.20, 28,170.88 and 11,463.69 is: 15,818.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,415.20 : 28,170.88 = 11,463.69 : x
  2. Step 2: Convert to fraction form
    20,415.20/28,170.88 = 11,463.69/x
  3. Step 3: Cross multiply
    20,415.20x = 28,170.88 × 11,463.69
  4. Step 4: Simplify right side
    20,415.20x = 322,942,235.35
  5. Step 5: Solve for x
    x = 322,942,235.35/20,415.20
  6. Step 6: Final answer
    x = 15,818.72

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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.