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Finding the Fourth Proportional to 12,787.76, 17,647.10 and 7,198.88

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Solution

The fourth proportional to 12,787.76, 17,647.10 and 7,198.88 is: 9,934.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,787.76 : 17,647.10 = 7,198.88 : x
  2. Step 2: Convert to fraction form
    12,787.76/17,647.10 = 7,198.88/x
  3. Step 3: Cross multiply
    12,787.76x = 17,647.10 × 7,198.88
  4. Step 4: Simplify right side
    12,787.76x = 127,039,355.25
  5. Step 5: Solve for x
    x = 127,039,355.25/12,787.76
  6. Step 6: Final answer
    x = 9,934.45

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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.