Home / 20,787.84-28,687.32-11,356.56

Finding the Fourth Proportional to 20,787.84, 28,687.32 and 11,356.56

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Solution

The fourth proportional to 20,787.84, 28,687.32 and 11,356.56 is: 15,672.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,787.84 : 28,687.32 = 11,356.56 : x
  2. Step 2: Convert to fraction form
    20,787.84/28,687.32 = 11,356.56/x
  3. Step 3: Cross multiply
    20,787.84x = 28,687.32 × 11,356.56
  4. Step 4: Simplify right side
    20,787.84x = 325,789,270.82
  5. Step 5: Solve for x
    x = 325,789,270.82/20,787.84
  6. Step 6: Final answer
    x = 15,672.11

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1.5x scale

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.