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Finding the Fourth Proportional to 1,821, 2,731.50 and 453

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Solution

The fourth proportional to 1,821, 2,731.50 and 453 is: 679.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,821 : 2,731.50 = 453 : x
  2. Step 2: Convert to fraction form
    1,821/2,731.50 = 453/x
  3. Step 3: Cross multiply
    1,821x = 2,731.50 × 453
  4. Step 4: Simplify right side
    1,821x = 1,237,369.50
  5. Step 5: Solve for x
    x = 1,237,369.50/1,821
  6. Step 6: Final answer
    x = 679.50

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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.