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Finding the Fourth Proportional to 158,274.72, 218,410.74 and 86,640.87

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Solution

The fourth proportional to 158,274.72, 218,410.74 and 86,640.87 is: 119,559.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    158,274.72 : 218,410.74 = 86,640.87 : x
  2. Step 2: Convert to fraction form
    158,274.72/218,410.74 = 86,640.87/x
  3. Step 3: Cross multiply
    158,274.72x = 218,410.74 × 86,640.87
  4. Step 4: Simplify right side
    158,274.72x = 18,923,296,530.94
  5. Step 5: Solve for x
    x = 18,923,296,530.94/158,274.72
  6. Step 6: Final answer
    x = 119,559.82

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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.