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Finding the Fourth Proportional to 1,775.91, 2,450.78 and 989.95

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Solution

The fourth proportional to 1,775.91, 2,450.78 and 989.95 is: 1,366.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,775.91 : 2,450.78 = 989.95 : x
  2. Step 2: Convert to fraction form
    1,775.91/2,450.78 = 989.95/x
  3. Step 3: Cross multiply
    1,775.91x = 2,450.78 × 989.95
  4. Step 4: Simplify right side
    1,775.91x = 2,426,149.66
  5. Step 5: Solve for x
    x = 2,426,149.66/1,775.91
  6. Step 6: Final answer
    x = 1,366.14

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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.