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Finding the Fourth Proportional to 210.21, 289.61 and 157.67

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Solution

The fourth proportional to 210.21, 289.61 and 157.67 is: 217.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    210.21 : 289.61 = 157.67 : x
  2. Step 2: Convert to fraction form
    210.21/289.61 = 157.67/x
  3. Step 3: Cross multiply
    210.21x = 289.61 × 157.67
  4. Step 4: Simplify right side
    210.21x = 45,663.14
  5. Step 5: Solve for x
    x = 45,663.14/210.21
  6. Step 6: Final answer
    x = 217.23

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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.