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Finding the Fourth Proportional to 911.88, 1,368.24 and 425.25

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Solution

The fourth proportional to 911.88, 1,368.24 and 425.25 is: 638.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    911.88 : 1,368.24 = 425.25 : x
  2. Step 2: Convert to fraction form
    911.88/1,368.24 = 425.25/x
  3. Step 3: Cross multiply
    911.88x = 1,368.24 × 425.25
  4. Step 4: Simplify right side
    911.88x = 581,844.06
  5. Step 5: Solve for x
    x = 581,844.06/911.88
  6. Step 6: Final answer
    x = 638.07

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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.