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Finding the Fourth Proportional to 21,787.62, 32,683.26 and 8,640.12

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Solution

The fourth proportional to 21,787.62, 32,683.26 and 8,640.12 is: 12,960.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,787.62 : 32,683.26 = 8,640.12 : x
  2. Step 2: Convert to fraction form
    21,787.62/32,683.26 = 8,640.12/x
  3. Step 3: Cross multiply
    21,787.62x = 32,683.26 × 8,640.12
  4. Step 4: Simplify right side
    21,787.62x = 282,387,288.39
  5. Step 5: Solve for x
    x = 282,387,288.39/21,787.62
  6. Step 6: Final answer
    x = 12,960.91

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1.5x scale

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.