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Finding the Fourth Proportional to 2,625.68, 3,938.72 and 776.75

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Solution

The fourth proportional to 2,625.68, 3,938.72 and 776.75 is: 1,165.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,625.68 : 3,938.72 = 776.75 : x
  2. Step 2: Convert to fraction form
    2,625.68/3,938.72 = 776.75/x
  3. Step 3: Cross multiply
    2,625.68x = 3,938.72 × 776.75
  4. Step 4: Simplify right side
    2,625.68x = 3,059,377.18
  5. Step 5: Solve for x
    x = 3,059,377.18/2,625.68
  6. Step 6: Final answer
    x = 1,165.18

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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.