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Finding the Fourth Proportional to 139,686.52, 209,536.70 and 39,861.42

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Solution

The fourth proportional to 139,686.52, 209,536.70 and 39,861.42 is: 59,794.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,686.52 : 209,536.70 = 39,861.42 : x
  2. Step 2: Convert to fraction form
    139,686.52/209,536.70 = 39,861.42/x
  3. Step 3: Cross multiply
    139,686.52x = 209,536.70 × 39,861.42
  4. Step 4: Simplify right side
    139,686.52x = 8,352,430,204.81
  5. Step 5: Solve for x
    x = 8,352,430,204.81/139,686.52
  6. Step 6: Final answer
    x = 59,794.10

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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.