Home / 20,403.79-28,160.07-11,331.19

Finding the Fourth Proportional to 20,403.79, 28,160.07 and 11,331.19

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Solution

The fourth proportional to 20,403.79, 28,160.07 and 11,331.19 is: 15,638.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,403.79 : 28,160.07 = 11,331.19 : x
  2. Step 2: Convert to fraction form
    20,403.79/28,160.07 = 11,331.19/x
  3. Step 3: Cross multiply
    20,403.79x = 28,160.07 × 11,331.19
  4. Step 4: Simplify right side
    20,403.79x = 319,087,103.58
  5. Step 5: Solve for x
    x = 319,087,103.58/20,403.79
  6. Step 6: Final answer
    x = 15,638.62

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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.