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Finding the Fourth Proportional to 1,698.86, 2,344.01 and 990.65

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Solution

The fourth proportional to 1,698.86, 2,344.01 and 990.65 is: 1,366.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,698.86 : 2,344.01 = 990.65 : x
  2. Step 2: Convert to fraction form
    1,698.86/2,344.01 = 990.65/x
  3. Step 3: Cross multiply
    1,698.86x = 2,344.01 × 990.65
  4. Step 4: Simplify right side
    1,698.86x = 2,322,094.41
  5. Step 5: Solve for x
    x = 2,322,094.41/1,698.86
  6. Step 6: Final answer
    x = 1,366.85

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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.