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Finding the Fourth Proportional to 778.87, 1,173.68 and 644.93

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Solution

The fourth proportional to 778.87, 1,173.68 and 644.93 is: 971.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    778.87 : 1,173.68 = 644.93 : x
  2. Step 2: Convert to fraction form
    778.87/1,173.68 = 644.93/x
  3. Step 3: Cross multiply
    778.87x = 1,173.68 × 644.93
  4. Step 4: Simplify right side
    778.87x = 756,932.35
  5. Step 5: Solve for x
    x = 756,932.35/778.87
  6. Step 6: Final answer
    x = 971.84

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.