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Finding the Fourth Proportional to 285.15, 393.38 and 180.20

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Solution

The fourth proportional to 285.15, 393.38 and 180.20 is: 248.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.15 : 393.38 = 180.20 : x
  2. Step 2: Convert to fraction form
    285.15/393.38 = 180.20/x
  3. Step 3: Cross multiply
    285.15x = 393.38 × 180.20
  4. Step 4: Simplify right side
    285.15x = 70,885.11
  5. Step 5: Solve for x
    x = 70,885.11/285.15
  6. Step 6: Final answer
    x = 248.59

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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.