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Finding the Fourth Proportional to 285.07, 393.17 and 251.91

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Solution

The fourth proportional to 285.07, 393.17 and 251.91 is: 347.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.07 : 393.17 = 251.91 : x
  2. Step 2: Convert to fraction form
    285.07/393.17 = 251.91/x
  3. Step 3: Cross multiply
    285.07x = 393.17 × 251.91
  4. Step 4: Simplify right side
    285.07x = 99,043.61
  5. Step 5: Solve for x
    x = 99,043.61/285.07
  6. Step 6: Final answer
    x = 347.44

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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.