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Finding the Fourth Proportional to 51,074.40, 76,669.20 and 39,439.20

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Solution

The fourth proportional to 51,074.40, 76,669.20 and 39,439.20 is: 59,203.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    51,074.40 : 76,669.20 = 39,439.20 : x
  2. Step 2: Convert to fraction form
    51,074.40/76,669.20 = 39,439.20/x
  3. Step 3: Cross multiply
    51,074.40x = 76,669.20 × 39,439.20
  4. Step 4: Simplify right side
    51,074.40x = 3,023,771,912.64
  5. Step 5: Solve for x
    x = 3,023,771,912.64/51,074.40
  6. Step 6: Final answer
    x = 59,203.28

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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.