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Finding the Fourth Proportional to 1,004.78, 1,387.86 and 911.22

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Solution

The fourth proportional to 1,004.78, 1,387.86 and 911.22 is: 1,258.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,004.78 : 1,387.86 = 911.22 : x
  2. Step 2: Convert to fraction form
    1,004.78/1,387.86 = 911.22/x
  3. Step 3: Cross multiply
    1,004.78x = 1,387.86 × 911.22
  4. Step 4: Simplify right side
    1,004.78x = 1,264,645.79
  5. Step 5: Solve for x
    x = 1,264,645.79/1,004.78
  6. Step 6: Final answer
    x = 1,258.63

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.