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Finding the Fourth Proportional to 76,912.20, 115,281.90 and 39,457.80

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Solution

The fourth proportional to 76,912.20, 115,281.90 and 39,457.80 is: 59,142.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,912.20 : 115,281.90 = 39,457.80 : x
  2. Step 2: Convert to fraction form
    76,912.20/115,281.90 = 39,457.80/x
  3. Step 3: Cross multiply
    76,912.20x = 115,281.90 × 39,457.80
  4. Step 4: Simplify right side
    76,912.20x = 4,548,770,153.82
  5. Step 5: Solve for x
    x = 4,548,770,153.82/76,912.20
  6. Step 6: Final answer
    x = 59,142.37

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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.