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Finding the Fourth Proportional to 139,438.32, 192,429.72 and 75,780.96

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Solution

The fourth proportional to 139,438.32, 192,429.72 and 75,780.96 is: 104,580.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,438.32 : 192,429.72 = 75,780.96 : x
  2. Step 2: Convert to fraction form
    139,438.32/192,429.72 = 75,780.96/x
  3. Step 3: Cross multiply
    139,438.32x = 192,429.72 × 75,780.96
  4. Step 4: Simplify right side
    139,438.32x = 14,582,508,914.13
  5. Step 5: Solve for x
    x = 14,582,508,914.13/139,438.32
  6. Step 6: Final answer
    x = 104,580.35

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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.