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Finding the Fourth Proportional to 285.77, 394.37 and 154.78

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Solution

The fourth proportional to 285.77, 394.37 and 154.78 is: 213.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.77 : 394.37 = 154.78 : x
  2. Step 2: Convert to fraction form
    285.77/394.37 = 154.78/x
  3. Step 3: Cross multiply
    285.77x = 394.37 × 154.78
  4. Step 4: Simplify right side
    285.77x = 61,040.89
  5. Step 5: Solve for x
    x = 61,040.89/285.77
  6. Step 6: Final answer
    x = 213.60

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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.