Home / 15,789.02-21,787.31-8,715

Finding the Fourth Proportional to 15,789.02, 21,787.31 and 8,715

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Solution

The fourth proportional to 15,789.02, 21,787.31 and 8,715 is: 12,025.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,789.02 : 21,787.31 = 8,715 : x
  2. Step 2: Convert to fraction form
    15,789.02/21,787.31 = 8,715/x
  3. Step 3: Cross multiply
    15,789.02x = 21,787.31 × 8,715
  4. Step 4: Simplify right side
    15,789.02x = 189,876,406.65
  5. Step 5: Solve for x
    x = 189,876,406.65/15,789.02
  6. Step 6: Final answer
    x = 12,025.85

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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.