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Finding the Fourth Proportional to 808.18, 1,212 and 260.23

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Solution

The fourth proportional to 808.18, 1,212 and 260.23 is: 390.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    808.18 : 1,212 = 260.23 : x
  2. Step 2: Convert to fraction form
    808.18/1,212 = 260.23/x
  3. Step 3: Cross multiply
    808.18x = 1,212 × 260.23
  4. Step 4: Simplify right side
    808.18x = 315,398.76
  5. Step 5: Solve for x
    x = 315,398.76/808.18
  6. Step 6: Final answer
    x = 390.26

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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.