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Finding the Fourth Proportional to 15,787.80, 21,787.02 and 8,714.34

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Solution

The fourth proportional to 15,787.80, 21,787.02 and 8,714.34 is: 12,025.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,787.80 : 21,787.02 = 8,714.34 : x
  2. Step 2: Convert to fraction form
    15,787.80/21,787.02 = 8,714.34/x
  3. Step 3: Cross multiply
    15,787.80x = 21,787.02 × 8,714.34
  4. Step 4: Simplify right side
    15,787.80x = 189,859,499.87
  5. Step 5: Solve for x
    x = 189,859,499.87/15,787.80
  6. Step 6: Final answer
    x = 12,025.71

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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.