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Finding the Fourth Proportional to 782.83, 1,168.12 and 778.28

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Solution

The fourth proportional to 782.83, 1,168.12 and 778.28 is: 1,161.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    782.83 : 1,168.12 = 778.28 : x
  2. Step 2: Convert to fraction form
    782.83/1,168.12 = 778.28/x
  3. Step 3: Cross multiply
    782.83x = 1,168.12 × 778.28
  4. Step 4: Simplify right side
    782.83x = 909,119.57
  5. Step 5: Solve for x
    x = 909,119.57/782.83
  6. Step 6: Final answer
    x = 1,161.32

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.