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Finding the Fourth Proportional to 911.12, 1,365.66 and 423.90

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Solution

The fourth proportional to 911.12, 1,365.66 and 423.90 is: 635.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    911.12 : 1,365.66 = 423.90 : x
  2. Step 2: Convert to fraction form
    911.12/1,365.66 = 423.90/x
  3. Step 3: Cross multiply
    911.12x = 1,365.66 × 423.90
  4. Step 4: Simplify right side
    911.12x = 578,903.27
  5. Step 5: Solve for x
    x = 578,903.27/911.12
  6. Step 6: Final answer
    x = 635.38

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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.