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Finding the Fourth Proportional to 790.57, 1,185.87 and 213.43

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Solution

The fourth proportional to 790.57, 1,185.87 and 213.43 is: 320.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    790.57 : 1,185.87 = 213.43 : x
  2. Step 2: Convert to fraction form
    790.57/1,185.87 = 213.43/x
  3. Step 3: Cross multiply
    790.57x = 1,185.87 × 213.43
  4. Step 4: Simplify right side
    790.57x = 253,100.23
  5. Step 5: Solve for x
    x = 253,100.23/790.57
  6. Step 6: Final answer
    x = 320.15

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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.