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Finding the Fourth Proportional to 445.32, 666.61 and 290.91

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Solution

The fourth proportional to 445.32, 666.61 and 290.91 is: 435.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    445.32 : 666.61 = 290.91 : x
  2. Step 2: Convert to fraction form
    445.32/666.61 = 290.91/x
  3. Step 3: Cross multiply
    445.32x = 666.61 × 290.91
  4. Step 4: Simplify right side
    445.32x = 193,923.52
  5. Step 5: Solve for x
    x = 193,923.52/445.32
  6. Step 6: Final answer
    x = 435.47

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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.