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Finding the Fourth Proportional to 1,557.82, 2,148.87 and 998.09

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Solution

The fourth proportional to 1,557.82, 2,148.87 and 998.09 is: 1,376.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,557.82 : 2,148.87 = 998.09 : x
  2. Step 2: Convert to fraction form
    1,557.82/2,148.87 = 998.09/x
  3. Step 3: Cross multiply
    1,557.82x = 2,148.87 × 998.09
  4. Step 4: Simplify right side
    1,557.82x = 2,144,765.66
  5. Step 5: Solve for x
    x = 2,144,765.66/1,557.82
  6. Step 6: Final answer
    x = 1,376.77

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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.