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Finding the Fourth Proportional to 808.45, 1,212.66 and 260.53

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Solution

The fourth proportional to 808.45, 1,212.66 and 260.53 is: 390.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    808.45 : 1,212.66 = 260.53 : x
  2. Step 2: Convert to fraction form
    808.45/1,212.66 = 260.53/x
  3. Step 3: Cross multiply
    808.45x = 1,212.66 × 260.53
  4. Step 4: Simplify right side
    808.45x = 315,931.28
  5. Step 5: Solve for x
    x = 315,931.28/808.45
  6. Step 6: Final answer
    x = 390.79

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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.