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Finding the Fourth Proportional to 70.51, 105.74 and 21.74

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Solution

The fourth proportional to 70.51, 105.74 and 21.74 is: 32.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    70.51 : 105.74 = 21.74 : x
  2. Step 2: Convert to fraction form
    70.51/105.74 = 21.74/x
  3. Step 3: Cross multiply
    70.51x = 105.74 × 21.74
  4. Step 4: Simplify right side
    70.51x = 2,298.94
  5. Step 5: Solve for x
    x = 2,298.94/70.51
  6. Step 6: Final answer
    x = 32.61

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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.