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Finding the Fourth Proportional to 20,671.36, 28,526.28 and 11,240

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Solution

The fourth proportional to 20,671.36, 28,526.28 and 11,240 is: 15,511.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,671.36 : 28,526.28 = 11,240 : x
  2. Step 2: Convert to fraction form
    20,671.36/28,526.28 = 11,240/x
  3. Step 3: Cross multiply
    20,671.36x = 28,526.28 × 11,240
  4. Step 4: Simplify right side
    20,671.36x = 320,635,387.20
  5. Step 5: Solve for x
    x = 320,635,387.20/20,671.36
  6. Step 6: Final answer
    x = 15,511.09

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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.