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Finding the Fourth Proportional to 145.12, 198.88 and 143.22

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Solution

The fourth proportional to 145.12, 198.88 and 143.22 is: 196.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    145.12 : 198.88 = 143.22 : x
  2. Step 2: Convert to fraction form
    145.12/198.88 = 143.22/x
  3. Step 3: Cross multiply
    145.12x = 198.88 × 143.22
  4. Step 4: Simplify right side
    145.12x = 28,483.27
  5. Step 5: Solve for x
    x = 28,483.27/145.12
  6. Step 6: Final answer
    x = 196.28

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.