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Finding the Fourth Proportional to 139,238.43, 192,143.88 and 75,574.86

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Solution

The fourth proportional to 139,238.43, 192,143.88 and 75,574.86 is: 104,290.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,238.43 : 192,143.88 = 75,574.86 : x
  2. Step 2: Convert to fraction form
    139,238.43/192,143.88 = 75,574.86/x
  3. Step 3: Cross multiply
    139,238.43x = 192,143.88 × 75,574.86
  4. Step 4: Simplify right side
    139,238.43x = 14,521,245,492.26
  5. Step 5: Solve for x
    x = 14,521,245,492.26/139,238.43
  6. Step 6: Final answer
    x = 104,290.50

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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.