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Finding the Fourth Proportional to 445.07, 666.99 and 387.43

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Solution

The fourth proportional to 445.07, 666.99 and 387.43 is: 580.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    445.07 : 666.99 = 387.43 : x
  2. Step 2: Convert to fraction form
    445.07/666.99 = 387.43/x
  3. Step 3: Cross multiply
    445.07x = 666.99 × 387.43
  4. Step 4: Simplify right side
    445.07x = 258,411.94
  5. Step 5: Solve for x
    x = 258,411.94/445.07
  6. Step 6: Final answer
    x = 580.61

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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.