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Finding the Fourth Proportional to 104.40, 156.57 and 84.15

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Solution

The fourth proportional to 104.40, 156.57 and 84.15 is: 126.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    104.40 : 156.57 = 84.15 : x
  2. Step 2: Convert to fraction form
    104.40/156.57 = 84.15/x
  3. Step 3: Cross multiply
    104.40x = 156.57 × 84.15
  4. Step 4: Simplify right side
    104.40x = 13,175.37
  5. Step 5: Solve for x
    x = 13,175.37/104.40
  6. Step 6: Final answer
    x = 126.20

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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.