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Finding the Fourth Proportional to 1,660.56, 2,291.74 and 997.40

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Solution

The fourth proportional to 1,660.56, 2,291.74 and 997.40 is: 1,376.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,660.56 : 2,291.74 = 997.40 : x
  2. Step 2: Convert to fraction form
    1,660.56/2,291.74 = 997.40/x
  3. Step 3: Cross multiply
    1,660.56x = 2,291.74 × 997.40
  4. Step 4: Simplify right side
    1,660.56x = 2,285,780.79
  5. Step 5: Solve for x
    x = 2,285,780.79/1,660.56
  6. Step 6: Final answer
    x = 1,376.51

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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.