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Finding the Fourth Proportional to 1,221.41, 1,830.29 and 911.81

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Solution

The fourth proportional to 1,221.41, 1,830.29 and 911.81 is: 1,366.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,221.41 : 1,830.29 = 911.81 : x
  2. Step 2: Convert to fraction form
    1,221.41/1,830.29 = 911.81/x
  3. Step 3: Cross multiply
    1,221.41x = 1,830.29 × 911.81
  4. Step 4: Simplify right side
    1,221.41x = 1,668,863.01
  5. Step 5: Solve for x
    x = 1,668,863.01/1,221.41
  6. Step 6: Final answer
    x = 1,366.35

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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.