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Finding the Fourth Proportional to 90,060, 135,089.84 and 30,912.80

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Solution

The fourth proportional to 90,060, 135,089.84 and 30,912.80 is: 46,369.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,060 : 135,089.84 = 30,912.80 : x
  2. Step 2: Convert to fraction form
    90,060/135,089.84 = 30,912.80/x
  3. Step 3: Cross multiply
    90,060x = 135,089.84 × 30,912.80
  4. Step 4: Simplify right side
    90,060x = 4,176,005,205.95
  5. Step 5: Solve for x
    x = 4,176,005,205.95/90,060
  6. Step 6: Final answer
    x = 46,369.15

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.