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Finding the Fourth Proportional to 783.21, 1,168.68 and 778.65

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Solution

The fourth proportional to 783.21, 1,168.68 and 778.65 is: 1,161.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    783.21 : 1,168.68 = 778.65 : x
  2. Step 2: Convert to fraction form
    783.21/1,168.68 = 778.65/x
  3. Step 3: Cross multiply
    783.21x = 1,168.68 × 778.65
  4. Step 4: Simplify right side
    783.21x = 909,992.68
  5. Step 5: Solve for x
    x = 909,992.68/783.21
  6. Step 6: Final answer
    x = 1,161.88

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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.