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Finding the Fourth Proportional to 805.45, 1,208.35 and 257.66

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Solution

The fourth proportional to 805.45, 1,208.35 and 257.66 is: 386.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    805.45 : 1,208.35 = 257.66 : x
  2. Step 2: Convert to fraction form
    805.45/1,208.35 = 257.66/x
  3. Step 3: Cross multiply
    805.45x = 1,208.35 × 257.66
  4. Step 4: Simplify right side
    805.45x = 311,343.46
  5. Step 5: Solve for x
    x = 311,343.46/805.45
  6. Step 6: Final answer
    x = 386.55

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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.