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Finding the Fourth Proportional to 21,125.12, 31,692 and 7,086.56

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Solution

The fourth proportional to 21,125.12, 31,692 and 7,086.56 is: 10,631.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,125.12 : 31,692 = 7,086.56 : x
  2. Step 2: Convert to fraction form
    21,125.12/31,692 = 7,086.56/x
  3. Step 3: Cross multiply
    21,125.12x = 31,692 × 7,086.56
  4. Step 4: Simplify right side
    21,125.12x = 224,587,259.52
  5. Step 5: Solve for x
    x = 224,587,259.52/21,125.12
  6. Step 6: Final answer
    x = 10,631.29

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.