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Finding the Fourth Proportional to 139,885.71, 209,858.39 and 45,121.21

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Solution

The fourth proportional to 139,885.71, 209,858.39 and 45,121.21 is: 67,691.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,885.71 : 209,858.39 = 45,121.21 : x
  2. Step 2: Convert to fraction form
    139,885.71/209,858.39 = 45,121.21/x
  3. Step 3: Cross multiply
    139,885.71x = 209,858.39 × 45,121.21
  4. Step 4: Simplify right side
    139,885.71x = 9,469,064,485.45
  5. Step 5: Solve for x
    x = 9,469,064,485.45/139,885.71
  6. Step 6: Final answer
    x = 67,691.44

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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.