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Finding the Fourth Proportional to 285.66, 428.22 and 258.12

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Solution

The fourth proportional to 285.66, 428.22 and 258.12 is: 386.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.66 : 428.22 = 258.12 : x
  2. Step 2: Convert to fraction form
    285.66/428.22 = 258.12/x
  3. Step 3: Cross multiply
    285.66x = 428.22 × 258.12
  4. Step 4: Simplify right side
    285.66x = 110,532.15
  5. Step 5: Solve for x
    x = 110,532.15/285.66
  6. Step 6: Final answer
    x = 386.94

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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.