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Finding the Fourth Proportional to 807.95, 1,211.81 and 485.36

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Solution

The fourth proportional to 807.95, 1,211.81 and 485.36 is: 727.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    807.95 : 1,211.81 = 485.36 : x
  2. Step 2: Convert to fraction form
    807.95/1,211.81 = 485.36/x
  3. Step 3: Cross multiply
    807.95x = 1,211.81 × 485.36
  4. Step 4: Simplify right side
    807.95x = 588,155.62
  5. Step 5: Solve for x
    x = 588,155.62/807.95
  6. Step 6: Final answer
    x = 727.96

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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.