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Finding the Fourth Proportional to 1,221.36, 1,830.69 and 490.47

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Solution

The fourth proportional to 1,221.36, 1,830.69 and 490.47 is: 735.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,221.36 : 1,830.69 = 490.47 : x
  2. Step 2: Convert to fraction form
    1,221.36/1,830.69 = 490.47/x
  3. Step 3: Cross multiply
    1,221.36x = 1,830.69 × 490.47
  4. Step 4: Simplify right side
    1,221.36x = 897,898.52
  5. Step 5: Solve for x
    x = 897,898.52/1,221.36
  6. Step 6: Final answer
    x = 735.16

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Double scale
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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.