Home / 11,920.78-16,451.36-6,615.51

Finding the Fourth Proportional to 11,920.78, 16,451.36 and 6,615.51

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Solution

The fourth proportional to 11,920.78, 16,451.36 and 6,615.51 is: 9,129.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,920.78 : 16,451.36 = 6,615.51 : x
  2. Step 2: Convert to fraction form
    11,920.78/16,451.36 = 6,615.51/x
  3. Step 3: Cross multiply
    11,920.78x = 16,451.36 × 6,615.51
  4. Step 4: Simplify right side
    11,920.78x = 108,834,136.59
  5. Step 5: Solve for x
    x = 108,834,136.59/11,920.78
  6. Step 6: Final answer
    x = 9,129.78

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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.