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Finding the Fourth Proportional to 90,611.20, 135,657.60 and 55,619.20

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Solution

The fourth proportional to 90,611.20, 135,657.60 and 55,619.20 is: 83,269.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,611.20 : 135,657.60 = 55,619.20 : x
  2. Step 2: Convert to fraction form
    90,611.20/135,657.60 = 55,619.20/x
  3. Step 3: Cross multiply
    90,611.20x = 135,657.60 × 55,619.20
  4. Step 4: Simplify right side
    90,611.20x = 7,545,167,185.92
  5. Step 5: Solve for x
    x = 7,545,167,185.92/90,611.20
  6. Step 6: Final answer
    x = 83,269.70

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1.5x scale

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.