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Finding the Fourth Proportional to 190,603.56, 285,930.94 and 72,318.76

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Solution

The fourth proportional to 190,603.56, 285,930.94 and 72,318.76 is: 108,487.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    190,603.56 : 285,930.94 = 72,318.76 : x
  2. Step 2: Convert to fraction form
    190,603.56/285,930.94 = 72,318.76/x
  3. Step 3: Cross multiply
    190,603.56x = 285,930.94 × 72,318.76
  4. Step 4: Simplify right side
    190,603.56x = 20,678,171,026.43
  5. Step 5: Solve for x
    x = 20,678,171,026.43/190,603.56
  6. Step 6: Final answer
    x = 108,487.85

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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.