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Finding the Fourth Proportional to 285.48, 428.94 and 258.84

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Solution

The fourth proportional to 285.48, 428.94 and 258.84 is: 388.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.48 : 428.94 = 258.84 : x
  2. Step 2: Convert to fraction form
    285.48/428.94 = 258.84/x
  3. Step 3: Cross multiply
    285.48x = 428.94 × 258.84
  4. Step 4: Simplify right side
    285.48x = 111,026.83
  5. Step 5: Solve for x
    x = 111,026.83/285.48
  6. Step 6: Final answer
    x = 388.91

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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.