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Finding the Fourth Proportional to 30.94, 42.98 and 30.64

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Solution

The fourth proportional to 30.94, 42.98 and 30.64 is: 42.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    30.94 : 42.98 = 30.64 : x
  2. Step 2: Convert to fraction form
    30.94/42.98 = 30.64/x
  3. Step 3: Cross multiply
    30.94x = 42.98 × 30.64
  4. Step 4: Simplify right side
    30.94x = 1,316.91
  5. Step 5: Solve for x
    x = 1,316.91/30.94
  6. Step 6: Final answer
    x = 42.56

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.