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Finding the Fourth Proportional to 103.98, 156 and 63.45

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Solution

The fourth proportional to 103.98, 156 and 63.45 is: 95.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.98 : 156 = 63.45 : x
  2. Step 2: Convert to fraction form
    103.98/156 = 63.45/x
  3. Step 3: Cross multiply
    103.98x = 156 × 63.45
  4. Step 4: Simplify right side
    103.98x = 9,898.20
  5. Step 5: Solve for x
    x = 9,898.20/103.98
  6. Step 6: Final answer
    x = 95.19

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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.