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Finding the Fourth Proportional to 9,078.88, 12,519.36 and 7,187.44

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Solution

The fourth proportional to 9,078.88, 12,519.36 and 7,187.44 is: 9,911.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,078.88 : 12,519.36 = 7,187.44 : x
  2. Step 2: Convert to fraction form
    9,078.88/12,519.36 = 7,187.44/x
  3. Step 3: Cross multiply
    9,078.88x = 12,519.36 × 7,187.44
  4. Step 4: Simplify right side
    9,078.88x = 89,982,148.84
  5. Step 5: Solve for x
    x = 89,982,148.84/9,078.88
  6. Step 6: Final answer
    x = 9,911.15

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Half scale
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Double scale
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Similar ratio
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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.