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Finding the Fourth Proportional to 139,037.80, 191,871.78 and 75,375.40

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Solution

The fourth proportional to 139,037.80, 191,871.78 and 75,375.40 is: 104,017.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,037.80 : 191,871.78 = 75,375.40 : x
  2. Step 2: Convert to fraction form
    139,037.80/191,871.78 = 75,375.40/x
  3. Step 3: Cross multiply
    139,037.80x = 191,871.78 × 75,375.40
  4. Step 4: Simplify right side
    139,037.80x = 14,462,412,166.21
  5. Step 5: Solve for x
    x = 14,462,412,166.21/139,037.80
  6. Step 6: Final answer
    x = 104,017.84

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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.