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Finding the Fourth Proportional to 5,709.78, 7,878.66 and 3,191.58

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Solution

The fourth proportional to 5,709.78, 7,878.66 and 3,191.58 is: 4,403.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,709.78 : 7,878.66 = 3,191.58 : x
  2. Step 2: Convert to fraction form
    5,709.78/7,878.66 = 3,191.58/x
  3. Step 3: Cross multiply
    5,709.78x = 7,878.66 × 3,191.58
  4. Step 4: Simplify right side
    5,709.78x = 25,145,373.68
  5. Step 5: Solve for x
    x = 25,145,373.68/5,709.78
  6. Step 6: Final answer
    x = 4,403.91

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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.