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Finding the Fourth Proportional to 139,545.71, 192,567.21 and 79,120.42

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Solution

The fourth proportional to 139,545.71, 192,567.21 and 79,120.42 is: 109,182.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,545.71 : 192,567.21 = 79,120.42 : x
  2. Step 2: Convert to fraction form
    139,545.71/192,567.21 = 79,120.42/x
  3. Step 3: Cross multiply
    139,545.71x = 192,567.21 × 79,120.42
  4. Step 4: Simplify right side
    139,545.71x = 15,235,997,570.59
  5. Step 5: Solve for x
    x = 15,235,997,570.59/139,545.71
  6. Step 6: Final answer
    x = 109,182.84

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.