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Finding the Fourth Proportional to 605.54, 907.86 and 386.12

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Solution

The fourth proportional to 605.54, 907.86 and 386.12 is: 578.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    605.54 : 907.86 = 386.12 : x
  2. Step 2: Convert to fraction form
    605.54/907.86 = 386.12/x
  3. Step 3: Cross multiply
    605.54x = 907.86 × 386.12
  4. Step 4: Simplify right side
    605.54x = 350,542.90
  5. Step 5: Solve for x
    x = 350,542.90/605.54
  6. Step 6: Final answer
    x = 578.89

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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.