Home / 12,991.07-17,920.89-8,512.58

Finding the Fourth Proportional to 12,991.07, 17,920.89 and 8,512.58

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Solution

The fourth proportional to 12,991.07, 17,920.89 and 8,512.58 is: 11,742.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,991.07 : 17,920.89 = 8,512.58 : x
  2. Step 2: Convert to fraction form
    12,991.07/17,920.89 = 8,512.58/x
  3. Step 3: Cross multiply
    12,991.07x = 17,920.89 × 8,512.58
  4. Step 4: Simplify right side
    12,991.07x = 152,552,920.19
  5. Step 5: Solve for x
    x = 152,552,920.19/12,991.07
  6. Step 6: Final answer
    x = 11,742.91

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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.