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Finding the Fourth Proportional to 666.20, 919.14 and 445.28

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Solution

The fourth proportional to 666.20, 919.14 and 445.28 is: 614.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.20 : 919.14 = 445.28 : x
  2. Step 2: Convert to fraction form
    666.20/919.14 = 445.28/x
  3. Step 3: Cross multiply
    666.20x = 919.14 × 445.28
  4. Step 4: Simplify right side
    666.20x = 409,274.66
  5. Step 5: Solve for x
    x = 409,274.66/666.20
  6. Step 6: Final answer
    x = 614.34

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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.