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Finding the Fourth Proportional to 67,991.20, 101,986.80 and 66,533.20

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Solution

The fourth proportional to 67,991.20, 101,986.80 and 66,533.20 is: 99,799.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    67,991.20 : 101,986.80 = 66,533.20 : x
  2. Step 2: Convert to fraction form
    67,991.20/101,986.80 = 66,533.20/x
  3. Step 3: Cross multiply
    67,991.20x = 101,986.80 × 66,533.20
  4. Step 4: Simplify right side
    67,991.20x = 6,785,508,161.76
  5. Step 5: Solve for x
    x = 6,785,508,161.76/67,991.20
  6. Step 6: Final answer
    x = 99,799.80

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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.