Home / 8,781.35-12,128.25-5,905.08

Finding the Fourth Proportional to 8,781.35, 12,128.25 and 5,905.08

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Solution

The fourth proportional to 8,781.35, 12,128.25 and 5,905.08 is: 8,155.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,781.35 : 12,128.25 = 5,905.08 : x
  2. Step 2: Convert to fraction form
    8,781.35/12,128.25 = 5,905.08/x
  3. Step 3: Cross multiply
    8,781.35x = 12,128.25 × 5,905.08
  4. Step 4: Simplify right side
    8,781.35x = 71,618,286.51
  5. Step 5: Solve for x
    x = 71,618,286.51/8,781.35
  6. Step 6: Final answer
    x = 8,155.73

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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.