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Finding the Fourth Proportional to 1,645.45, 2,466.96 and 778.75

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Solution

The fourth proportional to 1,645.45, 2,466.96 and 778.75 is: 1,167.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,645.45 : 2,466.96 = 778.75 : x
  2. Step 2: Convert to fraction form
    1,645.45/2,466.96 = 778.75/x
  3. Step 3: Cross multiply
    1,645.45x = 2,466.96 × 778.75
  4. Step 4: Simplify right side
    1,645.45x = 1,921,145.10
  5. Step 5: Solve for x
    x = 1,921,145.10/1,645.45
  6. Step 6: Final answer
    x = 1,167.55

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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.