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Finding the Fourth Proportional to 9,987.68, 13,788.96 and 8,880.64

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Solution

The fourth proportional to 9,987.68, 13,788.96 and 8,880.64 is: 12,260.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,987.68 : 13,788.96 = 8,880.64 : x
  2. Step 2: Convert to fraction form
    9,987.68/13,788.96 = 8,880.64/x
  3. Step 3: Cross multiply
    9,987.68x = 13,788.96 × 8,880.64
  4. Step 4: Simplify right side
    9,987.68x = 122,454,789.73
  5. Step 5: Solve for x
    x = 122,454,789.73/9,987.68
  6. Step 6: Final answer
    x = 12,260.58

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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.