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Finding the Fourth Proportional to 217.70, 300.45 and 158.70

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Solution

The fourth proportional to 217.70, 300.45 and 158.70 is: 219.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    217.70 : 300.45 = 158.70 : x
  2. Step 2: Convert to fraction form
    217.70/300.45 = 158.70/x
  3. Step 3: Cross multiply
    217.70x = 300.45 × 158.70
  4. Step 4: Simplify right side
    217.70x = 47,681.42
  5. Step 5: Solve for x
    x = 47,681.42/217.70
  6. Step 6: Final answer
    x = 219.02

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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.