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Finding the Fourth Proportional to 666.25, 919.45 and 386.43

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Solution

The fourth proportional to 666.25, 919.45 and 386.43 is: 533.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.25 : 919.45 = 386.43 : x
  2. Step 2: Convert to fraction form
    666.25/919.45 = 386.43/x
  3. Step 3: Cross multiply
    666.25x = 919.45 × 386.43
  4. Step 4: Simplify right side
    666.25x = 355,303.06
  5. Step 5: Solve for x
    x = 355,303.06/666.25
  6. Step 6: Final answer
    x = 533.29

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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.