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Finding the Fourth Proportional to 1,940.64, 2,911.05 and 554.18

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Solution

The fourth proportional to 1,940.64, 2,911.05 and 554.18 is: 831.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,940.64 : 2,911.05 = 554.18 : x
  2. Step 2: Convert to fraction form
    1,940.64/2,911.05 = 554.18/x
  3. Step 3: Cross multiply
    1,940.64x = 2,911.05 × 554.18
  4. Step 4: Simplify right side
    1,940.64x = 1,613,231.13
  5. Step 5: Solve for x
    x = 1,613,231.13/1,940.64
  6. Step 6: Final answer
    x = 831.29

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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.