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Finding the Fourth Proportional to 1,369.62, 2,054.79 and 492.21

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Solution

The fourth proportional to 1,369.62, 2,054.79 and 492.21 is: 738.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,369.62 : 2,054.79 = 492.21 : x
  2. Step 2: Convert to fraction form
    1,369.62/2,054.79 = 492.21/x
  3. Step 3: Cross multiply
    1,369.62x = 2,054.79 × 492.21
  4. Step 4: Simplify right side
    1,369.62x = 1,011,388.19
  5. Step 5: Solve for x
    x = 1,011,388.19/1,369.62
  6. Step 6: Final answer
    x = 738.44

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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.