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Finding the Fourth Proportional to 1,201.10, 1,801.34 and 542.72

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Solution

The fourth proportional to 1,201.10, 1,801.34 and 542.72 is: 813.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,201.10 : 1,801.34 = 542.72 : x
  2. Step 2: Convert to fraction form
    1,201.10/1,801.34 = 542.72/x
  3. Step 3: Cross multiply
    1,201.10x = 1,801.34 × 542.72
  4. Step 4: Simplify right side
    1,201.10x = 977,629.10
  5. Step 5: Solve for x
    x = 977,629.10/1,201.10
  6. Step 6: Final answer
    x = 813.95

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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.