Home / 15,787.89-21,786.30-8,714.31

Finding the Fourth Proportional to 15,787.89, 21,786.30 and 8,714.31

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Solution

The fourth proportional to 15,787.89, 21,786.30 and 8,714.31 is: 12,025.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,787.89 : 21,786.30 = 8,714.31 : x
  2. Step 2: Convert to fraction form
    15,787.89/21,786.30 = 8,714.31/x
  3. Step 3: Cross multiply
    15,787.89x = 21,786.30 × 8,714.31
  4. Step 4: Simplify right side
    15,787.89x = 189,852,571.95
  5. Step 5: Solve for x
    x = 189,852,571.95/15,787.89
  6. Step 6: Final answer
    x = 12,025.20

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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.