Home / 20,787.84-31,155.84-10,402.56

Finding the Fourth Proportional to 20,787.84, 31,155.84 and 10,402.56

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Solution

The fourth proportional to 20,787.84, 31,155.84 and 10,402.56 is: 15,590.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,787.84 : 31,155.84 = 10,402.56 : x
  2. Step 2: Convert to fraction form
    20,787.84/31,155.84 = 10,402.56/x
  3. Step 3: Cross multiply
    20,787.84x = 31,155.84 × 10,402.56
  4. Step 4: Simplify right side
    20,787.84x = 324,100,494.95
  5. Step 5: Solve for x
    x = 324,100,494.95/20,787.84
  6. Step 6: Final answer
    x = 15,590.87

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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.