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Finding the Fourth Proportional to 15,388, 21,235.44 and 8,765.28

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Solution

The fourth proportional to 15,388, 21,235.44 and 8,765.28 is: 12,096.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,388 : 21,235.44 = 8,765.28 : x
  2. Step 2: Convert to fraction form
    15,388/21,235.44 = 8,765.28/x
  3. Step 3: Cross multiply
    15,388x = 21,235.44 × 8,765.28
  4. Step 4: Simplify right side
    15,388x = 186,134,577.52
  5. Step 5: Solve for x
    x = 186,134,577.52/15,388
  6. Step 6: Final answer
    x = 12,096.09

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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.