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Finding the Fourth Proportional to 1,021.59, 1,532.26 and 281.28

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Solution

The fourth proportional to 1,021.59, 1,532.26 and 281.28 is: 421.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,021.59 : 1,532.26 = 281.28 : x
  2. Step 2: Convert to fraction form
    1,021.59/1,532.26 = 281.28/x
  3. Step 3: Cross multiply
    1,021.59x = 1,532.26 × 281.28
  4. Step 4: Simplify right side
    1,021.59x = 430,986.43
  5. Step 5: Solve for x
    x = 430,986.43/1,021.59
  6. Step 6: Final answer
    x = 421.88

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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.