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Finding the Fourth Proportional to 1,705.20, 2,557.96 and 665.28

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Solution

The fourth proportional to 1,705.20, 2,557.96 and 665.28 is: 997.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,705.20 : 2,557.96 = 665.28 : x
  2. Step 2: Convert to fraction form
    1,705.20/2,557.96 = 665.28/x
  3. Step 3: Cross multiply
    1,705.20x = 2,557.96 × 665.28
  4. Step 4: Simplify right side
    1,705.20x = 1,701,759.63
  5. Step 5: Solve for x
    x = 1,701,759.63/1,705.20
  6. Step 6: Final answer
    x = 997.98

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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.