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Finding the Fourth Proportional to 1,698.13, 2,343.42 and 990.46

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Solution

The fourth proportional to 1,698.13, 2,343.42 and 990.46 is: 1,366.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,698.13 : 2,343.42 = 990.46 : x
  2. Step 2: Convert to fraction form
    1,698.13/2,343.42 = 990.46/x
  3. Step 3: Cross multiply
    1,698.13x = 2,343.42 × 990.46
  4. Step 4: Simplify right side
    1,698.13x = 2,321,063.77
  5. Step 5: Solve for x
    x = 2,321,063.77/1,698.13
  6. Step 6: Final answer
    x = 1,366.84

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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.