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Finding the Fourth Proportional to 90,316.62, 135,474.32 and 70,611.75

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Solution

The fourth proportional to 90,316.62, 135,474.32 and 70,611.75 is: 105,917.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,316.62 : 135,474.32 = 70,611.75 : x
  2. Step 2: Convert to fraction form
    90,316.62/135,474.32 = 70,611.75/x
  3. Step 3: Cross multiply
    90,316.62x = 135,474.32 × 70,611.75
  4. Step 4: Simplify right side
    90,316.62x = 9,566,078,991.79
  5. Step 5: Solve for x
    x = 9,566,078,991.79/90,316.62
  6. Step 6: Final answer
    x = 105,917.15

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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.