Home / 11,691.28-16,135.50-6,978.16

Finding the Fourth Proportional to 11,691.28, 16,135.50 and 6,978.16

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Solution

The fourth proportional to 11,691.28, 16,135.50 and 6,978.16 is: 9,630.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,691.28 : 16,135.50 = 6,978.16 : x
  2. Step 2: Convert to fraction form
    11,691.28/16,135.50 = 6,978.16/x
  3. Step 3: Cross multiply
    11,691.28x = 16,135.50 × 6,978.16
  4. Step 4: Simplify right side
    11,691.28x = 112,596,100.68
  5. Step 5: Solve for x
    x = 112,596,100.68/11,691.28
  6. Step 6: Final answer
    x = 9,630.78

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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.