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Finding the Fourth Proportional to 1,045.84, 1,449.87 and 990.36

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Solution

The fourth proportional to 1,045.84, 1,449.87 and 990.36 is: 1,372.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,045.84 : 1,449.87 = 990.36 : x
  2. Step 2: Convert to fraction form
    1,045.84/1,449.87 = 990.36/x
  3. Step 3: Cross multiply
    1,045.84x = 1,449.87 × 990.36
  4. Step 4: Simplify right side
    1,045.84x = 1,435,893.25
  5. Step 5: Solve for x
    x = 1,435,893.25/1,045.84
  6. Step 6: Final answer
    x = 1,372.96

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.