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Finding the Fourth Proportional to 139,516.80, 209,275.20 and 133,611.90

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Solution

The fourth proportional to 139,516.80, 209,275.20 and 133,611.90 is: 200,417.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,516.80 : 209,275.20 = 133,611.90 : x
  2. Step 2: Convert to fraction form
    139,516.80/209,275.20 = 133,611.90/x
  3. Step 3: Cross multiply
    139,516.80x = 209,275.20 × 133,611.90
  4. Step 4: Simplify right side
    139,516.80x = 27,961,657,094.88
  5. Step 5: Solve for x
    x = 27,961,657,094.88/139,516.80
  6. Step 6: Final answer
    x = 200,417.85

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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.