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Finding the Fourth Proportional to 1,706.78, 2,355.40 and 998.70

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Solution

The fourth proportional to 1,706.78, 2,355.40 and 998.70 is: 1,378.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,706.78 : 2,355.40 = 998.70 : x
  2. Step 2: Convert to fraction form
    1,706.78/2,355.40 = 998.70/x
  3. Step 3: Cross multiply
    1,706.78x = 2,355.40 × 998.70
  4. Step 4: Simplify right side
    1,706.78x = 2,352,337.98
  5. Step 5: Solve for x
    x = 2,352,337.98/1,706.78
  6. Step 6: Final answer
    x = 1,378.23

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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.