Home / 15,787.29-21,813.16-12,216.81

Finding the Fourth Proportional to 15,787.29, 21,813.16 and 12,216.81

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Solution

The fourth proportional to 15,787.29, 21,813.16 and 12,216.81 is: 16,879.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,787.29 : 21,813.16 = 12,216.81 : x
  2. Step 2: Convert to fraction form
    15,787.29/21,813.16 = 12,216.81/x
  3. Step 3: Cross multiply
    15,787.29x = 21,813.16 × 12,216.81
  4. Step 4: Simplify right side
    15,787.29x = 266,487,231.22
  5. Step 5: Solve for x
    x = 266,487,231.22/15,787.29
  6. Step 6: Final answer
    x = 16,879.86

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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.