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Finding the Fourth Proportional to 1,392.80, 2,089.46 and 663.19

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Solution

The fourth proportional to 1,392.80, 2,089.46 and 663.19 is: 994.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,392.80 : 2,089.46 = 663.19 : x
  2. Step 2: Convert to fraction form
    1,392.80/2,089.46 = 663.19/x
  3. Step 3: Cross multiply
    1,392.80x = 2,089.46 × 663.19
  4. Step 4: Simplify right side
    1,392.80x = 1,385,705.41
  5. Step 5: Solve for x
    x = 1,385,705.41/1,392.80
  6. Step 6: Final answer
    x = 994.91

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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.