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Finding the Fourth Proportional to 90,234.70, 135,060.45 and 70,405.90

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Solution

The fourth proportional to 90,234.70, 135,060.45 and 70,405.90 is: 105,381.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,234.70 : 135,060.45 = 70,405.90 : x
  2. Step 2: Convert to fraction form
    90,234.70/135,060.45 = 70,405.90/x
  3. Step 3: Cross multiply
    90,234.70x = 135,060.45 × 70,405.90
  4. Step 4: Simplify right side
    90,234.70x = 9,509,052,536.66
  5. Step 5: Solve for x
    x = 9,509,052,536.66/90,234.70
  6. Step 6: Final answer
    x = 105,381.33

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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.