Home / 21,187.72-31,781.79-6,396.76

Finding the Fourth Proportional to 21,187.72, 31,781.79 and 6,396.76

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Solution

The fourth proportional to 21,187.72, 31,781.79 and 6,396.76 is: 9,595.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,187.72 : 31,781.79 = 6,396.76 : x
  2. Step 2: Convert to fraction form
    21,187.72/31,781.79 = 6,396.76/x
  3. Step 3: Cross multiply
    21,187.72x = 31,781.79 × 6,396.76
  4. Step 4: Simplify right side
    21,187.72x = 203,300,483.00
  5. Step 5: Solve for x
    x = 203,300,483.00/21,187.72
  6. Step 6: Final answer
    x = 9,595.20

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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.