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Finding the Fourth Proportional to 920.61, 1,270.62 and 605.32

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Solution

The fourth proportional to 920.61, 1,270.62 and 605.32 is: 835.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.61 : 1,270.62 = 605.32 : x
  2. Step 2: Convert to fraction form
    920.61/1,270.62 = 605.32/x
  3. Step 3: Cross multiply
    920.61x = 1,270.62 × 605.32
  4. Step 4: Simplify right side
    920.61x = 769,131.70
  5. Step 5: Solve for x
    x = 769,131.70/920.61
  6. Step 6: Final answer
    x = 835.46

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.