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Finding the Fourth Proportional to 2,634.58, 3,948.36 and 989.20

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Solution

The fourth proportional to 2,634.58, 3,948.36 and 989.20 is: 1,482.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,634.58 : 3,948.36 = 989.20 : x
  2. Step 2: Convert to fraction form
    2,634.58/3,948.36 = 989.20/x
  3. Step 3: Cross multiply
    2,634.58x = 3,948.36 × 989.20
  4. Step 4: Simplify right side
    2,634.58x = 3,905,717.71
  5. Step 5: Solve for x
    x = 3,905,717.71/2,634.58
  6. Step 6: Final answer
    x = 1,482.48

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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.