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Finding the Fourth Proportional to 139,135.71, 208,519.04 and 72,631.77

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Solution

The fourth proportional to 139,135.71, 208,519.04 and 72,631.77 is: 108,851.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,135.71 : 208,519.04 = 72,631.77 : x
  2. Step 2: Convert to fraction form
    139,135.71/208,519.04 = 72,631.77/x
  3. Step 3: Cross multiply
    139,135.71x = 208,519.04 × 72,631.77
  4. Step 4: Simplify right side
    139,135.71x = 15,145,106,590.74
  5. Step 5: Solve for x
    x = 15,145,106,590.74/139,135.71
  6. Step 6: Final answer
    x = 108,851.33

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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.