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Finding the Fourth Proportional to 2,630.36, 3,943.40 and 986

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Solution

The fourth proportional to 2,630.36, 3,943.40 and 986 is: 1,478.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,630.36 : 3,943.40 = 986 : x
  2. Step 2: Convert to fraction form
    2,630.36/3,943.40 = 986/x
  3. Step 3: Cross multiply
    2,630.36x = 3,943.40 × 986
  4. Step 4: Simplify right side
    2,630.36x = 3,888,192.40
  5. Step 5: Solve for x
    x = 3,888,192.40/2,630.36
  6. Step 6: Final answer
    x = 1,478.20

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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.