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Finding the Fourth Proportional to 21,787.63, 32,683.26 and 8,640.11

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Solution

The fourth proportional to 21,787.63, 32,683.26 and 8,640.11 is: 12,960.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,787.63 : 32,683.26 = 8,640.11 : x
  2. Step 2: Convert to fraction form
    21,787.63/32,683.26 = 8,640.11/x
  3. Step 3: Cross multiply
    21,787.63x = 32,683.26 × 8,640.11
  4. Step 4: Simplify right side
    21,787.63x = 282,386,961.56
  5. Step 5: Solve for x
    x = 282,386,961.56/21,787.63
  6. Step 6: Final answer
    x = 12,960.88

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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.