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Finding the Fourth Proportional to 12,479.40, 18,712.62 and 7,787.88

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Solution

The fourth proportional to 12,479.40, 18,712.62 and 7,787.88 is: 11,677.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,479.40 : 18,712.62 = 7,787.88 : x
  2. Step 2: Convert to fraction form
    12,479.40/18,712.62 = 7,787.88/x
  3. Step 3: Cross multiply
    12,479.40x = 18,712.62 × 7,787.88
  4. Step 4: Simplify right side
    12,479.40x = 145,731,639.05
  5. Step 5: Solve for x
    x = 145,731,639.05/12,479.40
  6. Step 6: Final answer
    x = 11,677.78

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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.