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Finding the Fourth Proportional to 20,807.88, 28,714.87 and 11,376.44

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Solution

The fourth proportional to 20,807.88, 28,714.87 and 11,376.44 is: 15,699.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,807.88 : 28,714.87 = 11,376.44 : x
  2. Step 2: Convert to fraction form
    20,807.88/28,714.87 = 11,376.44/x
  3. Step 3: Cross multiply
    20,807.88x = 28,714.87 × 11,376.44
  4. Step 4: Simplify right side
    20,807.88x = 326,672,995.66
  5. Step 5: Solve for x
    x = 326,672,995.66/20,807.88
  6. Step 6: Final answer
    x = 15,699.48

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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.