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Finding the Fourth Proportional to 666.05, 919.26 and 386.42

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Solution

The fourth proportional to 666.05, 919.26 and 386.42 is: 533.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.05 : 919.26 = 386.42 : x
  2. Step 2: Convert to fraction form
    666.05/919.26 = 386.42/x
  3. Step 3: Cross multiply
    666.05x = 919.26 × 386.42
  4. Step 4: Simplify right side
    666.05x = 355,215.85
  5. Step 5: Solve for x
    x = 355,215.85/666.05
  6. Step 6: Final answer
    x = 533.32

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Double scale
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1.5x scale

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.