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Finding the Fourth Proportional to 15,787.80, 21,813.86 and 12,217.32

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Solution

The fourth proportional to 15,787.80, 21,813.86 and 12,217.32 is: 16,880.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,787.80 : 21,813.86 = 12,217.32 : x
  2. Step 2: Convert to fraction form
    15,787.80/21,813.86 = 12,217.32/x
  3. Step 3: Cross multiply
    15,787.80x = 21,813.86 × 12,217.32
  4. Step 4: Simplify right side
    15,787.80x = 266,506,846.97
  5. Step 5: Solve for x
    x = 266,506,846.97/15,787.80
  6. Step 6: Final answer
    x = 16,880.56

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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.