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Finding the Fourth Proportional to 61,191.20, 91,786.80 and 45,639.20

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Solution

The fourth proportional to 61,191.20, 91,786.80 and 45,639.20 is: 68,458.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,191.20 : 91,786.80 = 45,639.20 : x
  2. Step 2: Convert to fraction form
    61,191.20/91,786.80 = 45,639.20/x
  3. Step 3: Cross multiply
    61,191.20x = 91,786.80 × 45,639.20
  4. Step 4: Simplify right side
    61,191.20x = 4,189,076,122.56
  5. Step 5: Solve for x
    x = 4,189,076,122.56/61,191.20
  6. Step 6: Final answer
    x = 68,458.80

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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.