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Finding the Fourth Proportional to 665.64, 918.72 and 444.42

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Solution

The fourth proportional to 665.64, 918.72 and 444.42 is: 613.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    665.64 : 918.72 = 444.42 : x
  2. Step 2: Convert to fraction form
    665.64/918.72 = 444.42/x
  3. Step 3: Cross multiply
    665.64x = 918.72 × 444.42
  4. Step 4: Simplify right side
    665.64x = 408,297.54
  5. Step 5: Solve for x
    x = 408,297.54/665.64
  6. Step 6: Final answer
    x = 613.39

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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.