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Finding the Fourth Proportional to 11,356, 15,671.28 and 6,388

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Solution

The fourth proportional to 11,356, 15,671.28 and 6,388 is: 8,815.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,356 : 15,671.28 = 6,388 : x
  2. Step 2: Convert to fraction form
    11,356/15,671.28 = 6,388/x
  3. Step 3: Cross multiply
    11,356x = 15,671.28 × 6,388
  4. Step 4: Simplify right side
    11,356x = 100,108,136.64
  5. Step 5: Solve for x
    x = 100,108,136.64/11,356
  6. Step 6: Final answer
    x = 8,815.44

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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.