Home / 20,965.09-28,932.35-11,405.51

Finding the Fourth Proportional to 20,965.09, 28,932.35 and 11,405.51

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Solution

The fourth proportional to 20,965.09, 28,932.35 and 11,405.51 is: 15,739.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,965.09 : 28,932.35 = 11,405.51 : x
  2. Step 2: Convert to fraction form
    20,965.09/28,932.35 = 11,405.51/x
  3. Step 3: Cross multiply
    20,965.09x = 28,932.35 × 11,405.51
  4. Step 4: Simplify right side
    20,965.09x = 329,988,265.32
  5. Step 5: Solve for x
    x = 329,988,265.32/20,965.09
  6. Step 6: Final answer
    x = 15,739.89

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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.