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Finding the Fourth Proportional to 8,640.88, 11,923.16 and 5,005.55

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Solution

The fourth proportional to 8,640.88, 11,923.16 and 5,005.55 is: 6,906.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,640.88 : 11,923.16 = 5,005.55 : x
  2. Step 2: Convert to fraction form
    8,640.88/11,923.16 = 5,005.55/x
  3. Step 3: Cross multiply
    8,640.88x = 11,923.16 × 5,005.55
  4. Step 4: Simplify right side
    8,640.88x = 59,681,973.54
  5. Step 5: Solve for x
    x = 59,681,973.54/8,640.88
  6. Step 6: Final answer
    x = 6,906.93

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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.