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Finding the Fourth Proportional to 70.77, 105.99 and 56.22

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Solution

The fourth proportional to 70.77, 105.99 and 56.22 is: 84.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    70.77 : 105.99 = 56.22 : x
  2. Step 2: Convert to fraction form
    70.77/105.99 = 56.22/x
  3. Step 3: Cross multiply
    70.77x = 105.99 × 56.22
  4. Step 4: Simplify right side
    70.77x = 5,958.76
  5. Step 5: Solve for x
    x = 5,958.76/70.77
  6. Step 6: Final answer
    x = 84.20

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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.