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Finding the Fourth Proportional to 778.09, 1,167.54 and 612.54

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Solution

The fourth proportional to 778.09, 1,167.54 and 612.54 is: 919.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    778.09 : 1,167.54 = 612.54 : x
  2. Step 2: Convert to fraction form
    778.09/1,167.54 = 612.54/x
  3. Step 3: Cross multiply
    778.09x = 1,167.54 × 612.54
  4. Step 4: Simplify right side
    778.09x = 715,161.89
  5. Step 5: Solve for x
    x = 715,161.89/778.09
  6. Step 6: Final answer
    x = 919.13

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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.