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Finding the Fourth Proportional to 1,408.73, 1,941.99 and 987.81

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Solution

The fourth proportional to 1,408.73, 1,941.99 and 987.81 is: 1,361.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,408.73 : 1,941.99 = 987.81 : x
  2. Step 2: Convert to fraction form
    1,408.73/1,941.99 = 987.81/x
  3. Step 3: Cross multiply
    1,408.73x = 1,941.99 × 987.81
  4. Step 4: Simplify right side
    1,408.73x = 1,918,317.14
  5. Step 5: Solve for x
    x = 1,918,317.14/1,408.73
  6. Step 6: Final answer
    x = 1,361.74

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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.