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Finding the Fourth Proportional to 790.31, 1,185.63 and 270.29

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Solution

The fourth proportional to 790.31, 1,185.63 and 270.29 is: 405.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    790.31 : 1,185.63 = 270.29 : x
  2. Step 2: Convert to fraction form
    790.31/1,185.63 = 270.29/x
  3. Step 3: Cross multiply
    790.31x = 1,185.63 × 270.29
  4. Step 4: Simplify right side
    790.31x = 320,458.00
  5. Step 5: Solve for x
    x = 320,458.00/790.31
  6. Step 6: Final answer
    x = 405.49

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Double scale
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1.5x scale

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.