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Finding the Fourth Proportional to 9,872.80, 14,787.60 and 8,778.40

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Solution

The fourth proportional to 9,872.80, 14,787.60 and 8,778.40 is: 13,148.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,872.80 : 14,787.60 = 8,778.40 : x
  2. Step 2: Convert to fraction form
    9,872.80/14,787.60 = 8,778.40/x
  3. Step 3: Cross multiply
    9,872.80x = 14,787.60 × 8,778.40
  4. Step 4: Simplify right side
    9,872.80x = 129,811,467.84
  5. Step 5: Solve for x
    x = 129,811,467.84/9,872.80
  6. Step 6: Final answer
    x = 13,148.39

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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.