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Finding the Fourth Proportional to 665.97, 919.22 and 386.25

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Solution

The fourth proportional to 665.97, 919.22 and 386.25 is: 533.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    665.97 : 919.22 = 386.25 : x
  2. Step 2: Convert to fraction form
    665.97/919.22 = 386.25/x
  3. Step 3: Cross multiply
    665.97x = 919.22 × 386.25
  4. Step 4: Simplify right side
    665.97x = 355,046.79
  5. Step 5: Solve for x
    x = 355,046.79/665.97
  6. Step 6: Final answer
    x = 533.13

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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.