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Finding the Fourth Proportional to 281.40, 421.30 and 143.77

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Solution

The fourth proportional to 281.40, 421.30 and 143.77 is: 215.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    281.40 : 421.30 = 143.77 : x
  2. Step 2: Convert to fraction form
    281.40/421.30 = 143.77/x
  3. Step 3: Cross multiply
    281.40x = 421.30 × 143.77
  4. Step 4: Simplify right side
    281.40x = 60,570.30
  5. Step 5: Solve for x
    x = 60,570.30/281.40
  6. Step 6: Final answer
    x = 215.25

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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.