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Finding the Fourth Proportional to 790.23, 1,185.49 and 270.21

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Solution

The fourth proportional to 790.23, 1,185.49 and 270.21 is: 405.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    790.23 : 1,185.49 = 270.21 : x
  2. Step 2: Convert to fraction form
    790.23/1,185.49 = 270.21/x
  3. Step 3: Cross multiply
    790.23x = 1,185.49 × 270.21
  4. Step 4: Simplify right side
    790.23x = 320,331.25
  5. Step 5: Solve for x
    x = 320,331.25/790.23
  6. Step 6: Final answer
    x = 405.36

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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.