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Finding the Fourth Proportional to 15,877.80, 23,787.90 and 12,940.20

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Solution

The fourth proportional to 15,877.80, 23,787.90 and 12,940.20 is: 19,386.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,877.80 : 23,787.90 = 12,940.20 : x
  2. Step 2: Convert to fraction form
    15,877.80/23,787.90 = 12,940.20/x
  3. Step 3: Cross multiply
    15,877.80x = 23,787.90 × 12,940.20
  4. Step 4: Simplify right side
    15,877.80x = 307,820,183.58
  5. Step 5: Solve for x
    x = 307,820,183.58/15,877.80
  6. Step 6: Final answer
    x = 19,386.83

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.