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Finding the Fourth Proportional to 104.70, 157.31 and 104.20

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Solution

The fourth proportional to 104.70, 157.31 and 104.20 is: 156.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    104.70 : 157.31 = 104.20 : x
  2. Step 2: Convert to fraction form
    104.70/157.31 = 104.20/x
  3. Step 3: Cross multiply
    104.70x = 157.31 × 104.20
  4. Step 4: Simplify right side
    104.70x = 16,391.18
  5. Step 5: Solve for x
    x = 16,391.18/104.70
  6. Step 6: Final answer
    x = 156.55

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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.