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Finding the Fourth Proportional to 790.70, 1,186.11 and 243.27

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Solution

The fourth proportional to 790.70, 1,186.11 and 243.27 is: 364.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    790.70 : 1,186.11 = 243.27 : x
  2. Step 2: Convert to fraction form
    790.70/1,186.11 = 243.27/x
  3. Step 3: Cross multiply
    790.70x = 1,186.11 × 243.27
  4. Step 4: Simplify right side
    790.70x = 288,537.83
  5. Step 5: Solve for x
    x = 288,537.83/790.70
  6. Step 6: Final answer
    x = 364.91

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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.