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Finding the Fourth Proportional to 5,717.15, 7,872.12 and 5,005.01

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Solution

The fourth proportional to 5,717.15, 7,872.12 and 5,005.01 is: 6,891.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,717.15 : 7,872.12 = 5,005.01 : x
  2. Step 2: Convert to fraction form
    5,717.15/7,872.12 = 5,005.01/x
  3. Step 3: Cross multiply
    5,717.15x = 7,872.12 × 5,005.01
  4. Step 4: Simplify right side
    5,717.15x = 39,399,999.96
  5. Step 5: Solve for x
    x = 39,399,999.96/5,717.15
  6. Step 6: Final answer
    x = 6,891.55

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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.