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Finding the Fourth Proportional to 801.10, 1,201.65 and 541.90

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Solution

The fourth proportional to 801.10, 1,201.65 and 541.90 is: 812.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    801.10 : 1,201.65 = 541.90 : x
  2. Step 2: Convert to fraction form
    801.10/1,201.65 = 541.90/x
  3. Step 3: Cross multiply
    801.10x = 1,201.65 × 541.90
  4. Step 4: Simplify right side
    801.10x = 651,174.14
  5. Step 5: Solve for x
    x = 651,174.14/801.10
  6. Step 6: Final answer
    x = 812.85

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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.