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Finding the Fourth Proportional to 2,165.30, 3,245.99 and 778.31

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Solution

The fourth proportional to 2,165.30, 3,245.99 and 778.31 is: 1,166.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,165.30 : 3,245.99 = 778.31 : x
  2. Step 2: Convert to fraction form
    2,165.30/3,245.99 = 778.31/x
  3. Step 3: Cross multiply
    2,165.30x = 3,245.99 × 778.31
  4. Step 4: Simplify right side
    2,165.30x = 2,526,366.36
  5. Step 5: Solve for x
    x = 2,526,366.36/2,165.30
  6. Step 6: Final answer
    x = 1,166.75

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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.