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Finding the Fourth Proportional to 1,645.56, 2,468.82 and 778.68

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Solution

The fourth proportional to 1,645.56, 2,468.82 and 778.68 is: 1,168.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,645.56 : 2,468.82 = 778.68 : x
  2. Step 2: Convert to fraction form
    1,645.56/2,468.82 = 778.68/x
  3. Step 3: Cross multiply
    1,645.56x = 2,468.82 × 778.68
  4. Step 4: Simplify right side
    1,645.56x = 1,922,420.76
  5. Step 5: Solve for x
    x = 1,922,420.76/1,645.56
  6. Step 6: Final answer
    x = 1,168.25

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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.