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Finding the Fourth Proportional to 666.18, 918.38 and 445.05

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Solution

The fourth proportional to 666.18, 918.38 and 445.05 is: 613.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.18 : 918.38 = 445.05 : x
  2. Step 2: Convert to fraction form
    666.18/918.38 = 445.05/x
  3. Step 3: Cross multiply
    666.18x = 918.38 × 445.05
  4. Step 4: Simplify right side
    666.18x = 408,725.02
  5. Step 5: Solve for x
    x = 408,725.02/666.18
  6. Step 6: Final answer
    x = 613.54

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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.