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Finding the Fourth Proportional to 73,139.70, 109,709.55 and 61,329.90

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Solution

The fourth proportional to 73,139.70, 109,709.55 and 61,329.90 is: 91,994.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    73,139.70 : 109,709.55 = 61,329.90 : x
  2. Step 2: Convert to fraction form
    73,139.70/109,709.55 = 61,329.90/x
  3. Step 3: Cross multiply
    73,139.70x = 109,709.55 × 61,329.90
  4. Step 4: Simplify right side
    73,139.70x = 6,728,475,730.55
  5. Step 5: Solve for x
    x = 6,728,475,730.55/73,139.70
  6. Step 6: Final answer
    x = 91,994.85

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.