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Finding the Fourth Proportional to 67,661.60, 101,492.40 and 20,919.20

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Solution

The fourth proportional to 67,661.60, 101,492.40 and 20,919.20 is: 31,378.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    67,661.60 : 101,492.40 = 20,919.20 : x
  2. Step 2: Convert to fraction form
    67,661.60/101,492.40 = 20,919.20/x
  3. Step 3: Cross multiply
    67,661.60x = 101,492.40 × 20,919.20
  4. Step 4: Simplify right side
    67,661.60x = 2,123,139,814.08
  5. Step 5: Solve for x
    x = 2,123,139,814.08/67,661.60
  6. Step 6: Final answer
    x = 31,378.80

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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.