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Finding the Fourth Proportional to 285.55, 427.70 and 217.10

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Solution

The fourth proportional to 285.55, 427.70 and 217.10 is: 325.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.55 : 427.70 = 217.10 : x
  2. Step 2: Convert to fraction form
    285.55/427.70 = 217.10/x
  3. Step 3: Cross multiply
    285.55x = 427.70 × 217.10
  4. Step 4: Simplify right side
    285.55x = 92,855.28
  5. Step 5: Solve for x
    x = 92,855.28/285.55
  6. Step 6: Final answer
    x = 325.18

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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.