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Finding the Fourth Proportional to 76,889.92, 115,234.40 and 39,418.24

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Solution

The fourth proportional to 76,889.92, 115,234.40 and 39,418.24 is: 59,075.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,889.92 : 115,234.40 = 39,418.24 : x
  2. Step 2: Convert to fraction form
    76,889.92/115,234.40 = 39,418.24/x
  3. Step 3: Cross multiply
    76,889.92x = 115,234.40 × 39,418.24
  4. Step 4: Simplify right side
    76,889.92x = 4,542,337,235.46
  5. Step 5: Solve for x
    x = 4,542,337,235.46/76,889.92
  6. Step 6: Final answer
    x = 59,075.85

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1.5x scale

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.