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Finding the Fourth Proportional to 911.05, 1,365.42 and 390.44

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Solution

The fourth proportional to 911.05, 1,365.42 and 390.44 is: 585.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    911.05 : 1,365.42 = 390.44 : x
  2. Step 2: Convert to fraction form
    911.05/1,365.42 = 390.44/x
  3. Step 3: Cross multiply
    911.05x = 1,365.42 × 390.44
  4. Step 4: Simplify right side
    911.05x = 533,111.78
  5. Step 5: Solve for x
    x = 533,111.78/911.05
  6. Step 6: Final answer
    x = 585.16

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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.