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Finding the Fourth Proportional to 990.04, 1,374.85 and 980.44

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Solution

The fourth proportional to 990.04, 1,374.85 and 980.44 is: 1,361.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.04 : 1,374.85 = 980.44 : x
  2. Step 2: Convert to fraction form
    990.04/1,374.85 = 980.44/x
  3. Step 3: Cross multiply
    990.04x = 1,374.85 × 980.44
  4. Step 4: Simplify right side
    990.04x = 1,347,957.93
  5. Step 5: Solve for x
    x = 1,347,957.93/990.04
  6. Step 6: Final answer
    x = 1,361.52

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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.