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Finding the Fourth Proportional to 445.68, 668.90 and 388.08

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Solution

The fourth proportional to 445.68, 668.90 and 388.08 is: 582.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    445.68 : 668.90 = 388.08 : x
  2. Step 2: Convert to fraction form
    445.68/668.90 = 388.08/x
  3. Step 3: Cross multiply
    445.68x = 668.90 × 388.08
  4. Step 4: Simplify right side
    445.68x = 259,586.71
  5. Step 5: Solve for x
    x = 259,586.71/445.68
  6. Step 6: Final answer
    x = 582.45

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.