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Finding the Fourth Proportional to 1,410.95, 1,947.11 and 789.95

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Solution

The fourth proportional to 1,410.95, 1,947.11 and 789.95 is: 1,090.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,410.95 : 1,947.11 = 789.95 : x
  2. Step 2: Convert to fraction form
    1,410.95/1,947.11 = 789.95/x
  3. Step 3: Cross multiply
    1,410.95x = 1,947.11 × 789.95
  4. Step 4: Simplify right side
    1,410.95x = 1,538,115.59
  5. Step 5: Solve for x
    x = 1,538,115.59/1,410.95
  6. Step 6: Final answer
    x = 1,090.13

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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.