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Finding the Fourth Proportional to 1,791.12, 2,686.64 and 492.60

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Solution

The fourth proportional to 1,791.12, 2,686.64 and 492.60 is: 738.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,791.12 : 2,686.64 = 492.60 : x
  2. Step 2: Convert to fraction form
    1,791.12/2,686.64 = 492.60/x
  3. Step 3: Cross multiply
    1,791.12x = 2,686.64 × 492.60
  4. Step 4: Simplify right side
    1,791.12x = 1,323,438.86
  5. Step 5: Solve for x
    x = 1,323,438.86/1,791.12
  6. Step 6: Final answer
    x = 738.89

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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.