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Finding the Fourth Proportional to 87,809.86, 121,149.03 and 55,989.01

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Solution

The fourth proportional to 87,809.86, 121,149.03 and 55,989.01 is: 77,246.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,809.86 : 121,149.03 = 55,989.01 : x
  2. Step 2: Convert to fraction form
    87,809.86/121,149.03 = 55,989.01/x
  3. Step 3: Cross multiply
    87,809.86x = 121,149.03 × 55,989.01
  4. Step 4: Simplify right side
    87,809.86x = 6,783,014,252.16
  5. Step 5: Solve for x
    x = 6,783,014,252.16/87,809.86
  6. Step 6: Final answer
    x = 77,246.61

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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.