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Finding the Fourth Proportional to 139,404.85, 192,378.90 and 75,742.63

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Solution

The fourth proportional to 139,404.85, 192,378.90 and 75,742.63 is: 104,524.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,404.85 : 192,378.90 = 75,742.63 : x
  2. Step 2: Convert to fraction form
    139,404.85/192,378.90 = 75,742.63/x
  3. Step 3: Cross multiply
    139,404.85x = 192,378.90 × 75,742.63
  4. Step 4: Simplify right side
    139,404.85x = 14,571,283,842.51
  5. Step 5: Solve for x
    x = 14,571,283,842.51/139,404.85
  6. Step 6: Final answer
    x = 104,524.94

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1.5x scale

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.