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Finding the Fourth Proportional to 139,361.31, 192,318.80 and 75,699.12

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Solution

The fourth proportional to 139,361.31, 192,318.80 and 75,699.12 is: 104,464.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,361.31 : 192,318.80 = 75,699.12 : x
  2. Step 2: Convert to fraction form
    139,361.31/192,318.80 = 75,699.12/x
  3. Step 3: Cross multiply
    139,361.31x = 192,318.80 × 75,699.12
  4. Step 4: Simplify right side
    139,361.31x = 14,558,363,919.46
  5. Step 5: Solve for x
    x = 14,558,363,919.46/139,361.31
  6. Step 6: Final answer
    x = 104,464.89

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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.