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Finding the Fourth Proportional to 8,679.72, 11,975.94 and 5,142.32

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Solution

The fourth proportional to 8,679.72, 11,975.94 and 5,142.32 is: 7,095.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,679.72 : 11,975.94 = 5,142.32 : x
  2. Step 2: Convert to fraction form
    8,679.72/11,975.94 = 5,142.32/x
  3. Step 3: Cross multiply
    8,679.72x = 11,975.94 × 5,142.32
  4. Step 4: Simplify right side
    8,679.72x = 61,584,055.90
  5. Step 5: Solve for x
    x = 61,584,055.90/8,679.72
  6. Step 6: Final answer
    x = 7,095.17

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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.