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Finding the Fourth Proportional to 1,021.61, 1,408.39 and 648.41

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Solution

The fourth proportional to 1,021.61, 1,408.39 and 648.41 is: 893.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,021.61 : 1,408.39 = 648.41 : x
  2. Step 2: Convert to fraction form
    1,021.61/1,408.39 = 648.41/x
  3. Step 3: Cross multiply
    1,021.61x = 1,408.39 × 648.41
  4. Step 4: Simplify right side
    1,021.61x = 913,205.50
  5. Step 5: Solve for x
    x = 913,205.50/1,021.61
  6. Step 6: Final answer
    x = 893.89

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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.