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Finding the Fourth Proportional to 78,372.99, 108,154.94 and 42,563.61

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Solution

The fourth proportional to 78,372.99, 108,154.94 and 42,563.61 is: 58,737.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,372.99 : 108,154.94 = 42,563.61 : x
  2. Step 2: Convert to fraction form
    78,372.99/108,154.94 = 42,563.61/x
  3. Step 3: Cross multiply
    78,372.99x = 108,154.94 × 42,563.61
  4. Step 4: Simplify right side
    78,372.99x = 4,603,464,472.92
  5. Step 5: Solve for x
    x = 4,603,464,472.92/78,372.99
  6. Step 6: Final answer
    x = 58,737.90

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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.