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Finding the Fourth Proportional to 485.15, 725.92 and 290.26

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Solution

The fourth proportional to 485.15, 725.92 and 290.26 is: 434.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.15 : 725.92 = 290.26 : x
  2. Step 2: Convert to fraction form
    485.15/725.92 = 290.26/x
  3. Step 3: Cross multiply
    485.15x = 725.92 × 290.26
  4. Step 4: Simplify right side
    485.15x = 210,705.54
  5. Step 5: Solve for x
    x = 210,705.54/485.15
  6. Step 6: Final answer
    x = 434.31

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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.