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Finding the Fourth Proportional to 281.32, 421.63 and 127.20

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Solution

The fourth proportional to 281.32, 421.63 and 127.20 is: 190.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    281.32 : 421.63 = 127.20 : x
  2. Step 2: Convert to fraction form
    281.32/421.63 = 127.20/x
  3. Step 3: Cross multiply
    281.32x = 421.63 × 127.20
  4. Step 4: Simplify right side
    281.32x = 53,631.02
  5. Step 5: Solve for x
    x = 53,631.02/281.32
  6. Step 6: Final answer
    x = 190.64

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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.