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Finding the Fourth Proportional to 139,336.80, 208,898.04 and 69,161.68

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Solution

The fourth proportional to 139,336.80, 208,898.04 and 69,161.68 is: 103,689.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,336.80 : 208,898.04 = 69,161.68 : x
  2. Step 2: Convert to fraction form
    139,336.80/208,898.04 = 69,161.68/x
  3. Step 3: Cross multiply
    139,336.80x = 208,898.04 × 69,161.68
  4. Step 4: Simplify right side
    139,336.80x = 14,447,739,395.11
  5. Step 5: Solve for x
    x = 14,447,739,395.11/139,336.80
  6. Step 6: Final answer
    x = 103,689.33

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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.