Home / 20,789.68-28,679.75-13,616.39

Finding the Fourth Proportional to 20,789.68, 28,679.75 and 13,616.39

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Solution

The fourth proportional to 20,789.68, 28,679.75 and 13,616.39 is: 18,784.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,789.68 : 28,679.75 = 13,616.39 : x
  2. Step 2: Convert to fraction form
    20,789.68/28,679.75 = 13,616.39/x
  3. Step 3: Cross multiply
    20,789.68x = 28,679.75 × 13,616.39
  4. Step 4: Simplify right side
    20,789.68x = 390,514,664.72
  5. Step 5: Solve for x
    x = 390,514,664.72/20,789.68
  6. Step 6: Final answer
    x = 18,784.07

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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.