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Finding the Fourth Proportional to 1,021.21, 1,529.80 and 673.50

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Solution

The fourth proportional to 1,021.21, 1,529.80 and 673.50 is: 1,008.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,021.21 : 1,529.80 = 673.50 : x
  2. Step 2: Convert to fraction form
    1,021.21/1,529.80 = 673.50/x
  3. Step 3: Cross multiply
    1,021.21x = 1,529.80 × 673.50
  4. Step 4: Simplify right side
    1,021.21x = 1,030,320.30
  5. Step 5: Solve for x
    x = 1,030,320.30/1,021.21
  6. Step 6: Final answer
    x = 1,008.92

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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.