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Finding the Fourth Proportional to 1,705.09, 2,557.38 and 665.56

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Solution

The fourth proportional to 1,705.09, 2,557.38 and 665.56 is: 998.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,705.09 : 2,557.38 = 665.56 : x
  2. Step 2: Convert to fraction form
    1,705.09/2,557.38 = 665.56/x
  3. Step 3: Cross multiply
    1,705.09x = 2,557.38 × 665.56
  4. Step 4: Simplify right side
    1,705.09x = 1,702,089.83
  5. Step 5: Solve for x
    x = 1,702,089.83/1,705.09
  6. Step 6: Final answer
    x = 998.24

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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.