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Finding the Fourth Proportional to 69.81, 104.54 and 56.31

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Solution

The fourth proportional to 69.81, 104.54 and 56.31 is: 84.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    69.81 : 104.54 = 56.31 : x
  2. Step 2: Convert to fraction form
    69.81/104.54 = 56.31/x
  3. Step 3: Cross multiply
    69.81x = 104.54 × 56.31
  4. Step 4: Simplify right side
    69.81x = 5,885.84
  5. Step 5: Solve for x
    x = 5,885.84/69.81
  6. Step 6: Final answer
    x = 84.32

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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.