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Finding the Fourth Proportional to 911.96, 1,368.75 and 425.28

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Solution

The fourth proportional to 911.96, 1,368.75 and 425.28 is: 638.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    911.96 : 1,368.75 = 425.28 : x
  2. Step 2: Convert to fraction form
    911.96/1,368.75 = 425.28/x
  3. Step 3: Cross multiply
    911.96x = 1,368.75 × 425.28
  4. Step 4: Simplify right side
    911.96x = 582,102
  5. Step 5: Solve for x
    x = 582,102/911.96
  6. Step 6: Final answer
    x = 638.30

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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.