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Finding the Fourth Proportional to 158,408.12, 218,603.21 and 86,790.86

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Solution

The fourth proportional to 158,408.12, 218,603.21 and 86,790.86 is: 119,771.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    158,408.12 : 218,603.21 = 86,790.86 : x
  2. Step 2: Convert to fraction form
    158,408.12/218,603.21 = 86,790.86/x
  3. Step 3: Cross multiply
    158,408.12x = 218,603.21 × 86,790.86
  4. Step 4: Simplify right side
    158,408.12x = 18,972,760,594.66
  5. Step 5: Solve for x
    x = 18,972,760,594.66/158,408.12
  6. Step 6: Final answer
    x = 119,771.39

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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.