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Finding the Fourth Proportional to 139,175.20, 208,827.60 and 72,690.40

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Solution

The fourth proportional to 139,175.20, 208,827.60 and 72,690.40 is: 109,069.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,175.20 : 208,827.60 = 72,690.40 : x
  2. Step 2: Convert to fraction form
    139,175.20/208,827.60 = 72,690.40/x
  3. Step 3: Cross multiply
    139,175.20x = 208,827.60 × 72,690.40
  4. Step 4: Simplify right side
    139,175.20x = 15,179,761,775.04
  5. Step 5: Solve for x
    x = 15,179,761,775.04/139,175.20
  6. Step 6: Final answer
    x = 109,069.44

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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.