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Finding the Fourth Proportional to 1,305.50, 1,799.51 and 989.75

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Solution

The fourth proportional to 1,305.50, 1,799.51 and 989.75 is: 1,364.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,305.50 : 1,799.51 = 989.75 : x
  2. Step 2: Convert to fraction form
    1,305.50/1,799.51 = 989.75/x
  3. Step 3: Cross multiply
    1,305.50x = 1,799.51 × 989.75
  4. Step 4: Simplify right side
    1,305.50x = 1,781,051.08
  5. Step 5: Solve for x
    x = 1,781,051.08/1,305.50
  6. Step 6: Final answer
    x = 1,364.27

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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.