Home / 20,787.68-31,175.32-10,921.60

Finding the Fourth Proportional to 20,787.68, 31,175.32 and 10,921.60

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Solution

The fourth proportional to 20,787.68, 31,175.32 and 10,921.60 is: 16,379.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,787.68 : 31,175.32 = 10,921.60 : x
  2. Step 2: Convert to fraction form
    20,787.68/31,175.32 = 10,921.60/x
  3. Step 3: Cross multiply
    20,787.68x = 31,175.32 × 10,921.60
  4. Step 4: Simplify right side
    20,787.68x = 340,484,374.91
  5. Step 5: Solve for x
    x = 340,484,374.91/20,787.68
  6. Step 6: Final answer
    x = 16,379.14

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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.