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Finding the Fourth Proportional to 779.13, 1,168.89 and 389.34

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Solution

The fourth proportional to 779.13, 1,168.89 and 389.34 is: 584.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    779.13 : 1,168.89 = 389.34 : x
  2. Step 2: Convert to fraction form
    779.13/1,168.89 = 389.34/x
  3. Step 3: Cross multiply
    779.13x = 1,168.89 × 389.34
  4. Step 4: Simplify right side
    779.13x = 455,095.63
  5. Step 5: Solve for x
    x = 455,095.63/779.13
  6. Step 6: Final answer
    x = 584.11

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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.