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Finding the Fourth Proportional to 56.39, 84.60 and 30.69

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Solution

The fourth proportional to 56.39, 84.60 and 30.69 is: 46.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    56.39 : 84.60 = 30.69 : x
  2. Step 2: Convert to fraction form
    56.39/84.60 = 30.69/x
  3. Step 3: Cross multiply
    56.39x = 84.60 × 30.69
  4. Step 4: Simplify right side
    56.39x = 2,596.37
  5. Step 5: Solve for x
    x = 2,596.37/56.39
  6. Step 6: Final answer
    x = 46.05

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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.