Home / 21,299.47-31,949.32-8,812.72

Finding the Fourth Proportional to 21,299.47, 31,949.32 and 8,812.72

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Solution

The fourth proportional to 21,299.47, 31,949.32 and 8,812.72 is: 13,219.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,299.47 : 31,949.32 = 8,812.72 : x
  2. Step 2: Convert to fraction form
    21,299.47/31,949.32 = 8,812.72/x
  3. Step 3: Cross multiply
    21,299.47x = 31,949.32 × 8,812.72
  4. Step 4: Simplify right side
    21,299.47x = 281,560,411.35
  5. Step 5: Solve for x
    x = 281,560,411.35/21,299.47
  6. Step 6: Final answer
    x = 13,219.13

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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.