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Finding the Fourth Proportional to 90,400.76, 135,583.50 and 66,485.91

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Solution

The fourth proportional to 90,400.76, 135,583.50 and 66,485.91 is: 99,715.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,400.76 : 135,583.50 = 66,485.91 : x
  2. Step 2: Convert to fraction form
    90,400.76/135,583.50 = 66,485.91/x
  3. Step 3: Cross multiply
    90,400.76x = 135,583.50 × 66,485.91
  4. Step 4: Simplify right side
    90,400.76x = 9,014,393,136.25
  5. Step 5: Solve for x
    x = 9,014,393,136.25/90,400.76
  6. Step 6: Final answer
    x = 99,715.90

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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.