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Finding the Fourth Proportional to 1,325.41, 1,985.03 and 1,279.28

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Solution

The fourth proportional to 1,325.41, 1,985.03 and 1,279.28 is: 1,915.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,325.41 : 1,985.03 = 1,279.28 : x
  2. Step 2: Convert to fraction form
    1,325.41/1,985.03 = 1,279.28/x
  3. Step 3: Cross multiply
    1,325.41x = 1,985.03 × 1,279.28
  4. Step 4: Simplify right side
    1,325.41x = 2,539,408.57
  5. Step 5: Solve for x
    x = 2,539,408.57/1,325.41
  6. Step 6: Final answer
    x = 1,915.95

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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.