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Finding the Fourth Proportional to 666.48, 919.56 and 445.29

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Solution

The fourth proportional to 666.48, 919.56 and 445.29 is: 614.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.48 : 919.56 = 445.29 : x
  2. Step 2: Convert to fraction form
    666.48/919.56 = 445.29/x
  3. Step 3: Cross multiply
    666.48x = 919.56 × 445.29
  4. Step 4: Simplify right side
    666.48x = 409,470.87
  5. Step 5: Solve for x
    x = 409,470.87/666.48
  6. Step 6: Final answer
    x = 614.38

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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.