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Finding the Fourth Proportional to 158,408.64, 218,603.91 and 86,791.35

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Solution

The fourth proportional to 158,408.64, 218,603.91 and 86,791.35 is: 119,772.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    158,408.64 : 218,603.91 = 86,791.35 : x
  2. Step 2: Convert to fraction form
    158,408.64/218,603.91 = 86,791.35/x
  3. Step 3: Cross multiply
    158,408.64x = 218,603.91 × 86,791.35
  4. Step 4: Simplify right side
    158,408.64x = 18,972,928,464.18
  5. Step 5: Solve for x
    x = 18,972,928,464.18/158,408.64
  6. Step 6: Final answer
    x = 119,772.06

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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.