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Finding the Fourth Proportional to 1,690.98, 2,333.49 and 982.78

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Solution

The fourth proportional to 1,690.98, 2,333.49 and 982.78 is: 1,356.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,690.98 : 2,333.49 = 982.78 : x
  2. Step 2: Convert to fraction form
    1,690.98/2,333.49 = 982.78/x
  3. Step 3: Cross multiply
    1,690.98x = 2,333.49 × 982.78
  4. Step 4: Simplify right side
    1,690.98x = 2,293,297.78
  5. Step 5: Solve for x
    x = 2,293,297.78/1,690.98
  6. Step 6: Final answer
    x = 1,356.20

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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.