Home / 20,355.89-28,091.13-12,398.12

Finding the Fourth Proportional to 20,355.89, 28,091.13 and 12,398.12

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Solution

The fourth proportional to 20,355.89, 28,091.13 and 12,398.12 is: 17,109.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,355.89 : 28,091.13 = 12,398.12 : x
  2. Step 2: Convert to fraction form
    20,355.89/28,091.13 = 12,398.12/x
  3. Step 3: Cross multiply
    20,355.89x = 28,091.13 × 12,398.12
  4. Step 4: Simplify right side
    20,355.89x = 348,277,074.93
  5. Step 5: Solve for x
    x = 348,277,074.93/20,355.89
  6. Step 6: Final answer
    x = 17,109.40

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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.