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Finding the Fourth Proportional to 1,415.80, 2,122.91 and 491.27

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Solution

The fourth proportional to 1,415.80, 2,122.91 and 491.27 is: 736.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,415.80 : 2,122.91 = 491.27 : x
  2. Step 2: Convert to fraction form
    1,415.80/2,122.91 = 491.27/x
  3. Step 3: Cross multiply
    1,415.80x = 2,122.91 × 491.27
  4. Step 4: Simplify right side
    1,415.80x = 1,042,922.00
  5. Step 5: Solve for x
    x = 1,042,922.00/1,415.80
  6. Step 6: Final answer
    x = 736.63

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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.