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Finding the Fourth Proportional to 666.27, 919.45 and 386.55

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Solution

The fourth proportional to 666.27, 919.45 and 386.55 is: 533.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.27 : 919.45 = 386.55 : x
  2. Step 2: Convert to fraction form
    666.27/919.45 = 386.55/x
  3. Step 3: Cross multiply
    666.27x = 919.45 × 386.55
  4. Step 4: Simplify right side
    666.27x = 355,413.40
  5. Step 5: Solve for x
    x = 355,413.40/666.27
  6. Step 6: Final answer
    x = 533.44

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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.