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Finding the Fourth Proportional to 20.58, 31.02 and 19.98

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Solution

The fourth proportional to 20.58, 31.02 and 19.98 is: 30.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    20.58 : 31.02 = 19.98 : x
  2. Step 2: Convert to fraction form
    20.58/31.02 = 19.98/x
  3. Step 3: Cross multiply
    20.58x = 31.02 × 19.98
  4. Step 4: Simplify right side
    20.58x = 619.78
  5. Step 5: Solve for x
    x = 619.78/20.58
  6. Step 6: Final answer
    x = 30.12

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.