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Finding the Fourth Proportional to 790.28, 1,185.45 and 270.31

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Solution

The fourth proportional to 790.28, 1,185.45 and 270.31 is: 405.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    790.28 : 1,185.45 = 270.31 : x
  2. Step 2: Convert to fraction form
    790.28/1,185.45 = 270.31/x
  3. Step 3: Cross multiply
    790.28x = 1,185.45 × 270.31
  4. Step 4: Simplify right side
    790.28x = 320,436.03
  5. Step 5: Solve for x
    x = 320,436.03/790.28
  6. Step 6: Final answer
    x = 405.47

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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.