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Finding the Fourth Proportional to 805.78, 1,206.98 and 480.97

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Solution

The fourth proportional to 805.78, 1,206.98 and 480.97 is: 720.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    805.78 : 1,206.98 = 480.97 : x
  2. Step 2: Convert to fraction form
    805.78/1,206.98 = 480.97/x
  3. Step 3: Cross multiply
    805.78x = 1,206.98 × 480.97
  4. Step 4: Simplify right side
    805.78x = 580,521.17
  5. Step 5: Solve for x
    x = 580,521.17/805.78
  6. Step 6: Final answer
    x = 720.45

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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.