Home / 20,787.78-28,683.84-11,835.46

Finding the Fourth Proportional to 20,787.78, 28,683.84 and 11,835.46

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Solution

The fourth proportional to 20,787.78, 28,683.84 and 11,835.46 is: 16,331.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,787.78 : 28,683.84 = 11,835.46 : x
  2. Step 2: Convert to fraction form
    20,787.78/28,683.84 = 11,835.46/x
  3. Step 3: Cross multiply
    20,787.78x = 28,683.84 × 11,835.46
  4. Step 4: Simplify right side
    20,787.78x = 339,486,521.20
  5. Step 5: Solve for x
    x = 339,486,521.20/20,787.78
  6. Step 6: Final answer
    x = 16,331.06

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.