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Finding the Fourth Proportional to 2,625.96, 3,939.16 and 678.20

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Solution

The fourth proportional to 2,625.96, 3,939.16 and 678.20 is: 1,017.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,625.96 : 3,939.16 = 678.20 : x
  2. Step 2: Convert to fraction form
    2,625.96/3,939.16 = 678.20/x
  3. Step 3: Cross multiply
    2,625.96x = 3,939.16 × 678.20
  4. Step 4: Simplify right side
    2,625.96x = 2,671,538.31
  5. Step 5: Solve for x
    x = 2,671,538.31/2,625.96
  6. Step 6: Final answer
    x = 1,017.36

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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.