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Finding the Fourth Proportional to 1,801.15, 2,699.60 and 812.81

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Solution

The fourth proportional to 1,801.15, 2,699.60 and 812.81 is: 1,218.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,801.15 : 2,699.60 = 812.81 : x
  2. Step 2: Convert to fraction form
    1,801.15/2,699.60 = 812.81/x
  3. Step 3: Cross multiply
    1,801.15x = 2,699.60 × 812.81
  4. Step 4: Simplify right side
    1,801.15x = 2,194,261.88
  5. Step 5: Solve for x
    x = 2,194,261.88/1,801.15
  6. Step 6: Final answer
    x = 1,218.26

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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.