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Finding the Fourth Proportional to 666.37, 919.54 and 386.56

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Solution

The fourth proportional to 666.37, 919.54 and 386.56 is: 533.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.37 : 919.54 = 386.56 : x
  2. Step 2: Convert to fraction form
    666.37/919.54 = 386.56/x
  3. Step 3: Cross multiply
    666.37x = 919.54 × 386.56
  4. Step 4: Simplify right side
    666.37x = 355,457.38
  5. Step 5: Solve for x
    x = 355,457.38/666.37
  6. Step 6: Final answer
    x = 533.42

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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.