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Finding the Fourth Proportional to 30.69, 45.84 and 20.98

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Solution

The fourth proportional to 30.69, 45.84 and 20.98 is: 31.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    30.69 : 45.84 = 20.98 : x
  2. Step 2: Convert to fraction form
    30.69/45.84 = 20.98/x
  3. Step 3: Cross multiply
    30.69x = 45.84 × 20.98
  4. Step 4: Simplify right side
    30.69x = 961.72
  5. Step 5: Solve for x
    x = 961.72/30.69
  6. Step 6: Final answer
    x = 31.34

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Find fourth proportional to 15.35, 22.92 and 10.49
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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.