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Finding the Fourth Proportional to 605.31, 912.39 and 553.47

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Solution

The fourth proportional to 605.31, 912.39 and 553.47 is: 834.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    605.31 : 912.39 = 553.47 : x
  2. Step 2: Convert to fraction form
    605.31/912.39 = 553.47/x
  3. Step 3: Cross multiply
    605.31x = 912.39 × 553.47
  4. Step 4: Simplify right side
    605.31x = 504,980.49
  5. Step 5: Solve for x
    x = 504,980.49/605.31
  6. Step 6: Final answer
    x = 834.25

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.