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Finding the Fourth Proportional to 442.91, 611.04 and 285.51

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Solution

The fourth proportional to 442.91, 611.04 and 285.51 is: 393.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    442.91 : 611.04 = 285.51 : x
  2. Step 2: Convert to fraction form
    442.91/611.04 = 285.51/x
  3. Step 3: Cross multiply
    442.91x = 611.04 × 285.51
  4. Step 4: Simplify right side
    442.91x = 174,455.55
  5. Step 5: Solve for x
    x = 174,455.55/442.91
  6. Step 6: Final answer
    x = 393.89

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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.