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Finding the Fourth Proportional to 1,698.19, 2,343.31 and 990.18

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Solution

The fourth proportional to 1,698.19, 2,343.31 and 990.18 is: 1,366.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,698.19 : 2,343.31 = 990.18 : x
  2. Step 2: Convert to fraction form
    1,698.19/2,343.31 = 990.18/x
  3. Step 3: Cross multiply
    1,698.19x = 2,343.31 × 990.18
  4. Step 4: Simplify right side
    1,698.19x = 2,320,296.22
  5. Step 5: Solve for x
    x = 2,320,296.22/1,698.19
  6. Step 6: Final answer
    x = 1,366.34

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Half scale
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Double scale
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1.5x scale

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.