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Finding the Fourth Proportional to 20,846.64, 28,768.07 and 11,415.20

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Solution

The fourth proportional to 20,846.64, 28,768.07 and 11,415.20 is: 15,752.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,846.64 : 28,768.07 = 11,415.20 : x
  2. Step 2: Convert to fraction form
    20,846.64/28,768.07 = 11,415.20/x
  3. Step 3: Cross multiply
    20,846.64x = 28,768.07 × 11,415.20
  4. Step 4: Simplify right side
    20,846.64x = 328,393,272.66
  5. Step 5: Solve for x
    x = 328,393,272.66/20,846.64
  6. Step 6: Final answer
    x = 15,752.82

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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.