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Finding the Fourth Proportional to 1,408.90, 2,113.28 and 676.24

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Solution

The fourth proportional to 1,408.90, 2,113.28 and 676.24 is: 1,014.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,408.90 : 2,113.28 = 676.24 : x
  2. Step 2: Convert to fraction form
    1,408.90/2,113.28 = 676.24/x
  3. Step 3: Cross multiply
    1,408.90x = 2,113.28 × 676.24
  4. Step 4: Simplify right side
    1,408.90x = 1,429,084.47
  5. Step 5: Solve for x
    x = 1,429,084.47/1,408.90
  6. Step 6: Final answer
    x = 1,014.33

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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.