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Finding the Fourth Proportional to 66,990.28, 100,485.42 and 39,273.16

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Solution

The fourth proportional to 66,990.28, 100,485.42 and 39,273.16 is: 58,909.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,990.28 : 100,485.42 = 39,273.16 : x
  2. Step 2: Convert to fraction form
    66,990.28/100,485.42 = 39,273.16/x
  3. Step 3: Cross multiply
    66,990.28x = 100,485.42 × 39,273.16
  4. Step 4: Simplify right side
    66,990.28x = 3,946,379,977.33
  5. Step 5: Solve for x
    x = 3,946,379,977.33/66,990.28
  6. Step 6: Final answer
    x = 58,909.74

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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.