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Finding the Fourth Proportional to 87,906.64, 121,311.54 and 47,620.40

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Solution

The fourth proportional to 87,906.64, 121,311.54 and 47,620.40 is: 65,716.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,906.64 : 121,311.54 = 47,620.40 : x
  2. Step 2: Convert to fraction form
    87,906.64/121,311.54 = 47,620.40/x
  3. Step 3: Cross multiply
    87,906.64x = 121,311.54 × 47,620.40
  4. Step 4: Simplify right side
    87,906.64x = 5,776,904,154.36
  5. Step 5: Solve for x
    x = 5,776,904,154.36/87,906.64
  6. Step 6: Final answer
    x = 65,716.35

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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.