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Finding the Fourth Proportional to 70.23, 105.21 and 35

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Solution

The fourth proportional to 70.23, 105.21 and 35 is: 52.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    70.23 : 105.21 = 35 : x
  2. Step 2: Convert to fraction form
    70.23/105.21 = 35/x
  3. Step 3: Cross multiply
    70.23x = 105.21 × 35
  4. Step 4: Simplify right side
    70.23x = 3,682.18
  5. Step 5: Solve for x
    x = 3,682.18/70.23
  6. Step 6: Final answer
    x = 52.43

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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.