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Finding the Fourth Proportional to 1,369.21, 2,054.24 and 491.11

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Solution

The fourth proportional to 1,369.21, 2,054.24 and 491.11 is: 736.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,369.21 : 2,054.24 = 491.11 : x
  2. Step 2: Convert to fraction form
    1,369.21/2,054.24 = 491.11/x
  3. Step 3: Cross multiply
    1,369.21x = 2,054.24 × 491.11
  4. Step 4: Simplify right side
    1,369.21x = 1,008,854.82
  5. Step 5: Solve for x
    x = 1,008,854.82/1,369.21
  6. Step 6: Final answer
    x = 736.82

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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.