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Finding the Fourth Proportional to 779.72, 1,168.97 and 389.51

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Solution

The fourth proportional to 779.72, 1,168.97 and 389.51 is: 583.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    779.72 : 1,168.97 = 389.51 : x
  2. Step 2: Convert to fraction form
    779.72/1,168.97 = 389.51/x
  3. Step 3: Cross multiply
    779.72x = 1,168.97 × 389.51
  4. Step 4: Simplify right side
    779.72x = 455,325.93
  5. Step 5: Solve for x
    x = 455,325.93/779.72
  6. Step 6: Final answer
    x = 583.96

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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.