Home / 15,787.81-21,787.15-8,714.22

Finding the Fourth Proportional to 15,787.81, 21,787.15 and 8,714.22

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Solution

The fourth proportional to 15,787.81, 21,787.15 and 8,714.22 is: 12,025.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,787.81 : 21,787.15 = 8,714.22 : x
  2. Step 2: Convert to fraction form
    15,787.81/21,787.15 = 8,714.22/x
  3. Step 3: Cross multiply
    15,787.81x = 21,787.15 × 8,714.22
  4. Step 4: Simplify right side
    15,787.81x = 189,858,018.27
  5. Step 5: Solve for x
    x = 189,858,018.27/15,787.81
  6. Step 6: Final answer
    x = 12,025.61

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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.