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Finding the Fourth Proportional to 1,230.71, 1,845.15 and 743.64

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Solution

The fourth proportional to 1,230.71, 1,845.15 and 743.64 is: 1,114.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,230.71 : 1,845.15 = 743.64 : x
  2. Step 2: Convert to fraction form
    1,230.71/1,845.15 = 743.64/x
  3. Step 3: Cross multiply
    1,230.71x = 1,845.15 × 743.64
  4. Step 4: Simplify right side
    1,230.71x = 1,372,128.02
  5. Step 5: Solve for x
    x = 1,372,128.02/1,230.71
  6. Step 6: Final answer
    x = 1,114.91

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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.