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Finding the Fourth Proportional to 285.21, 393.59 and 180.35

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Solution

The fourth proportional to 285.21, 393.59 and 180.35 is: 248.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.21 : 393.59 = 180.35 : x
  2. Step 2: Convert to fraction form
    285.21/393.59 = 180.35/x
  3. Step 3: Cross multiply
    285.21x = 393.59 × 180.35
  4. Step 4: Simplify right side
    285.21x = 70,983.96
  5. Step 5: Solve for x
    x = 70,983.96/285.21
  6. Step 6: Final answer
    x = 248.88

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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.