Home / 1,415.40-2,122.56-491.28

Finding the Fourth Proportional to 1,415.40, 2,122.56 and 491.28

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Solution

The fourth proportional to 1,415.40, 2,122.56 and 491.28 is: 736.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,415.40 : 2,122.56 = 491.28 : x
  2. Step 2: Convert to fraction form
    1,415.40/2,122.56 = 491.28/x
  3. Step 3: Cross multiply
    1,415.40x = 2,122.56 × 491.28
  4. Step 4: Simplify right side
    1,415.40x = 1,042,771.28
  5. Step 5: Solve for x
    x = 1,042,771.28/1,415.40
  6. Step 6: Final answer
    x = 736.73

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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.