Home / 12,787.68-17,644.80-7,121.76

Finding the Fourth Proportional to 12,787.68, 17,644.80 and 7,121.76

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Solution

The fourth proportional to 12,787.68, 17,644.80 and 7,121.76 is: 9,826.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,787.68 : 17,644.80 = 7,121.76 : x
  2. Step 2: Convert to fraction form
    12,787.68/17,644.80 = 7,121.76/x
  3. Step 3: Cross multiply
    12,787.68x = 17,644.80 × 7,121.76
  4. Step 4: Simplify right side
    12,787.68x = 125,662,030.85
  5. Step 5: Solve for x
    x = 125,662,030.85/12,787.68
  6. Step 6: Final answer
    x = 9,826.80

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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.