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Finding the Fourth Proportional to 1,419.69, 2,129.73 and 495.11

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Solution

The fourth proportional to 1,419.69, 2,129.73 and 495.11 is: 742.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,419.69 : 2,129.73 = 495.11 : x
  2. Step 2: Convert to fraction form
    1,419.69/2,129.73 = 495.11/x
  3. Step 3: Cross multiply
    1,419.69x = 2,129.73 × 495.11
  4. Step 4: Simplify right side
    1,419.69x = 1,054,437.50
  5. Step 5: Solve for x
    x = 1,054,437.50/1,419.69
  6. Step 6: Final answer
    x = 742.73

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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.