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Finding the Fourth Proportional to 1,236, 1,705.80 and 684

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Solution

The fourth proportional to 1,236, 1,705.80 and 684 is: 943.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,236 : 1,705.80 = 684 : x
  2. Step 2: Convert to fraction form
    1,236/1,705.80 = 684/x
  3. Step 3: Cross multiply
    1,236x = 1,705.80 × 684
  4. Step 4: Simplify right side
    1,236x = 1,166,767.20
  5. Step 5: Solve for x
    x = 1,166,767.20/1,236
  6. Step 6: Final answer
    x = 943.99

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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.