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Finding the Fourth Proportional to 1,705.32, 2,558.70 and 665.64

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Solution

The fourth proportional to 1,705.32, 2,558.70 and 665.64 is: 998.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,705.32 : 2,558.70 = 665.64 : x
  2. Step 2: Convert to fraction form
    1,705.32/2,558.70 = 665.64/x
  3. Step 3: Cross multiply
    1,705.32x = 2,558.70 × 665.64
  4. Step 4: Simplify right side
    1,705.32x = 1,703,173.07
  5. Step 5: Solve for x
    x = 1,703,173.07/1,705.32
  6. Step 6: Final answer
    x = 998.74

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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.