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Finding the Fourth Proportional to 158,425.63, 218,591.90 and 90,420.86

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Solution

The fourth proportional to 158,425.63, 218,591.90 and 90,420.86 is: 124,760.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    158,425.63 : 218,591.90 = 90,420.86 : x
  2. Step 2: Convert to fraction form
    158,425.63/218,591.90 = 90,420.86/x
  3. Step 3: Cross multiply
    158,425.63x = 218,591.90 × 90,420.86
  4. Step 4: Simplify right side
    158,425.63x = 19,765,267,134.93
  5. Step 5: Solve for x
    x = 19,765,267,134.93/158,425.63
  6. Step 6: Final answer
    x = 124,760.54

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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.