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Finding the Fourth Proportional to 261.85, 361.39 and 156.99

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Solution

The fourth proportional to 261.85, 361.39 and 156.99 is: 216.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.85 : 361.39 = 156.99 : x
  2. Step 2: Convert to fraction form
    261.85/361.39 = 156.99/x
  3. Step 3: Cross multiply
    261.85x = 361.39 × 156.99
  4. Step 4: Simplify right side
    261.85x = 56,734.62
  5. Step 5: Solve for x
    x = 56,734.62/261.85
  6. Step 6: Final answer
    x = 216.67

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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.