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Finding the Fourth Proportional to 1,210.99, 1,673.43 and 989.86

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Solution

The fourth proportional to 1,210.99, 1,673.43 and 989.86 is: 1,367.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,210.99 : 1,673.43 = 989.86 : x
  2. Step 2: Convert to fraction form
    1,210.99/1,673.43 = 989.86/x
  3. Step 3: Cross multiply
    1,210.99x = 1,673.43 × 989.86
  4. Step 4: Simplify right side
    1,210.99x = 1,656,453.05
  5. Step 5: Solve for x
    x = 1,656,453.05/1,210.99
  6. Step 6: Final answer
    x = 1,367.86

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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.