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Finding the Fourth Proportional to 285.81, 427.47 and 217.45

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Solution

The fourth proportional to 285.81, 427.47 and 217.45 is: 325.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.81 : 427.47 = 217.45 : x
  2. Step 2: Convert to fraction form
    285.81/427.47 = 217.45/x
  3. Step 3: Cross multiply
    285.81x = 427.47 × 217.45
  4. Step 4: Simplify right side
    285.81x = 92,953.35
  5. Step 5: Solve for x
    x = 92,953.35/285.81
  6. Step 6: Final answer
    x = 325.23

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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.