Home / 20,918.56-28,867.77-11,965.51

Finding the Fourth Proportional to 20,918.56, 28,867.77 and 11,965.51

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Solution

The fourth proportional to 20,918.56, 28,867.77 and 11,965.51 is: 16,512.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,918.56 : 28,867.77 = 11,965.51 : x
  2. Step 2: Convert to fraction form
    20,918.56/28,867.77 = 11,965.51/x
  3. Step 3: Cross multiply
    20,918.56x = 28,867.77 × 11,965.51
  4. Step 4: Simplify right side
    20,918.56x = 345,417,590.61
  5. Step 5: Solve for x
    x = 345,417,590.61/20,918.56
  6. Step 6: Final answer
    x = 16,512.49

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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.