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Finding the Fourth Proportional to 139,278.72, 208,891.36 and 39,414.80

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Solution

The fourth proportional to 139,278.72, 208,891.36 and 39,414.80 is: 59,114.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,278.72 : 208,891.36 = 39,414.80 : x
  2. Step 2: Convert to fraction form
    139,278.72/208,891.36 = 39,414.80/x
  3. Step 3: Cross multiply
    139,278.72x = 208,891.36 × 39,414.80
  4. Step 4: Simplify right side
    139,278.72x = 8,233,411,176.13
  5. Step 5: Solve for x
    x = 8,233,411,176.13/139,278.72
  6. Step 6: Final answer
    x = 59,114.64

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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.