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Finding the Fourth Proportional to 1,021.14, 1,408.57 and 578.72

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Solution

The fourth proportional to 1,021.14, 1,408.57 and 578.72 is: 798.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,021.14 : 1,408.57 = 578.72 : x
  2. Step 2: Convert to fraction form
    1,021.14/1,408.57 = 578.72/x
  3. Step 3: Cross multiply
    1,021.14x = 1,408.57 × 578.72
  4. Step 4: Simplify right side
    1,021.14x = 815,169.71
  5. Step 5: Solve for x
    x = 815,169.71/1,021.14
  6. Step 6: Final answer
    x = 798.29

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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.