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Finding the Fourth Proportional to 78,372.99, 108,155.52 and 42,563.70

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Solution

The fourth proportional to 78,372.99, 108,155.52 and 42,563.70 is: 58,738.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,372.99 : 108,155.52 = 42,563.70 : x
  2. Step 2: Convert to fraction form
    78,372.99/108,155.52 = 42,563.70/x
  3. Step 3: Cross multiply
    78,372.99x = 108,155.52 × 42,563.70
  4. Step 4: Simplify right side
    78,372.99x = 4,603,499,106.62
  5. Step 5: Solve for x
    x = 4,603,499,106.62/78,372.99
  6. Step 6: Final answer
    x = 58,738.34

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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.