Home / 20,986.72-28,961.08-11,426.24

Finding the Fourth Proportional to 20,986.72, 28,961.08 and 11,426.24

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Solution

The fourth proportional to 20,986.72, 28,961.08 and 11,426.24 is: 15,767.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,986.72 : 28,961.08 = 11,426.24 : x
  2. Step 2: Convert to fraction form
    20,986.72/28,961.08 = 11,426.24/x
  3. Step 3: Cross multiply
    20,986.72x = 28,961.08 × 11,426.24
  4. Step 4: Simplify right side
    20,986.72x = 330,916,250.74
  5. Step 5: Solve for x
    x = 330,916,250.74/20,986.72
  6. Step 6: Final answer
    x = 15,767.89

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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.