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Finding the Fourth Proportional to 1,021.80, 1,408.62 and 628.56

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Solution

The fourth proportional to 1,021.80, 1,408.62 and 628.56 is: 866.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,021.80 : 1,408.62 = 628.56 : x
  2. Step 2: Convert to fraction form
    1,021.80/1,408.62 = 628.56/x
  3. Step 3: Cross multiply
    1,021.80x = 1,408.62 × 628.56
  4. Step 4: Simplify right side
    1,021.80x = 885,402.19
  5. Step 5: Solve for x
    x = 885,402.19/1,021.80
  6. Step 6: Final answer
    x = 866.51

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.