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Finding the Fourth Proportional to 800.74, 1,201.11 and 458.50

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Solution

The fourth proportional to 800.74, 1,201.11 and 458.50 is: 687.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    800.74 : 1,201.11 = 458.50 : x
  2. Step 2: Convert to fraction form
    800.74/1,201.11 = 458.50/x
  3. Step 3: Cross multiply
    800.74x = 1,201.11 × 458.50
  4. Step 4: Simplify right side
    800.74x = 550,708.94
  5. Step 5: Solve for x
    x = 550,708.94/800.74
  6. Step 6: Final answer
    x = 687.75

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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.