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Finding the Fourth Proportional to 1,408.62, 1,943.66 and 819.18

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Solution

The fourth proportional to 1,408.62, 1,943.66 and 819.18 is: 1,130.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,408.62 : 1,943.66 = 819.18 : x
  2. Step 2: Convert to fraction form
    1,408.62/1,943.66 = 819.18/x
  3. Step 3: Cross multiply
    1,408.62x = 1,943.66 × 819.18
  4. Step 4: Simplify right side
    1,408.62x = 1,592,207.40
  5. Step 5: Solve for x
    x = 1,592,207.40/1,408.62
  6. Step 6: Final answer
    x = 1,130.33

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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.