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Finding the Fourth Proportional to 1,705.14, 2,557.68 and 679.14

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Solution

The fourth proportional to 1,705.14, 2,557.68 and 679.14 is: 1,018.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,705.14 : 2,557.68 = 679.14 : x
  2. Step 2: Convert to fraction form
    1,705.14/2,557.68 = 679.14/x
  3. Step 3: Cross multiply
    1,705.14x = 2,557.68 × 679.14
  4. Step 4: Simplify right side
    1,705.14x = 1,737,022.80
  5. Step 5: Solve for x
    x = 1,737,022.80/1,705.14
  6. Step 6: Final answer
    x = 1,018.70

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.