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Finding the Fourth Proportional to 105.42, 156.99 and 102.84

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Solution

The fourth proportional to 105.42, 156.99 and 102.84 is: 153.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    105.42 : 156.99 = 102.84 : x
  2. Step 2: Convert to fraction form
    105.42/156.99 = 102.84/x
  3. Step 3: Cross multiply
    105.42x = 156.99 × 102.84
  4. Step 4: Simplify right side
    105.42x = 16,144.85
  5. Step 5: Solve for x
    x = 16,144.85/105.42
  6. Step 6: Final answer
    x = 153.15

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.