Home / 2,625.80-3,938.88-777.20

Finding the Fourth Proportional to 2,625.80, 3,938.88 and 777.20

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Solution

The fourth proportional to 2,625.80, 3,938.88 and 777.20 is: 1,165.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,625.80 : 3,938.88 = 777.20 : x
  2. Step 2: Convert to fraction form
    2,625.80/3,938.88 = 777.20/x
  3. Step 3: Cross multiply
    2,625.80x = 3,938.88 × 777.20
  4. Step 4: Simplify right side
    2,625.80x = 3,061,297.54
  5. Step 5: Solve for x
    x = 3,061,297.54/2,625.80
  6. Step 6: Final answer
    x = 1,165.85

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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.