Home / 21,099.48-31,642.20-7,769.40

Finding the Fourth Proportional to 21,099.48, 31,642.20 and 7,769.40

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Solution

The fourth proportional to 21,099.48, 31,642.20 and 7,769.40 is: 11,651.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,099.48 : 31,642.20 = 7,769.40 : x
  2. Step 2: Convert to fraction form
    21,099.48/31,642.20 = 7,769.40/x
  3. Step 3: Cross multiply
    21,099.48x = 31,642.20 × 7,769.40
  4. Step 4: Simplify right side
    21,099.48x = 245,840,908.68
  5. Step 5: Solve for x
    x = 245,840,908.68/21,099.48
  6. Step 6: Final answer
    x = 11,651.52

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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.