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Finding the Fourth Proportional to 7,999.78, 11,035.78 and 5,169.58

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Solution

The fourth proportional to 7,999.78, 11,035.78 and 5,169.58 is: 7,131.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,999.78 : 11,035.78 = 5,169.58 : x
  2. Step 2: Convert to fraction form
    7,999.78/11,035.78 = 5,169.58/x
  3. Step 3: Cross multiply
    7,999.78x = 11,035.78 × 5,169.58
  4. Step 4: Simplify right side
    7,999.78x = 57,050,347.57
  5. Step 5: Solve for x
    x = 57,050,347.57/7,999.78
  6. Step 6: Final answer
    x = 7,131.49

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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.