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Finding the Fourth Proportional to 158,638.37, 218,932.09 and 90,665.40

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Solution

The fourth proportional to 158,638.37, 218,932.09 and 90,665.40 is: 125,124.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    158,638.37 : 218,932.09 = 90,665.40 : x
  2. Step 2: Convert to fraction form
    158,638.37/218,932.09 = 90,665.40/x
  3. Step 3: Cross multiply
    158,638.37x = 218,932.09 × 90,665.40
  4. Step 4: Simplify right side
    158,638.37x = 19,849,565,512.69
  5. Step 5: Solve for x
    x = 19,849,565,512.69/158,638.37
  6. Step 6: Final answer
    x = 125,124.62

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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.