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Finding the Fourth Proportional to 790.87, 1,186.31 and 213.75

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Solution

The fourth proportional to 790.87, 1,186.31 and 213.75 is: 320.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    790.87 : 1,186.31 = 213.75 : x
  2. Step 2: Convert to fraction form
    790.87/1,186.31 = 213.75/x
  3. Step 3: Cross multiply
    790.87x = 1,186.31 × 213.75
  4. Step 4: Simplify right side
    790.87x = 253,573.76
  5. Step 5: Solve for x
    x = 253,573.76/790.87
  6. Step 6: Final answer
    x = 320.63

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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.