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Finding the Fourth Proportional to 1,391.95, 2,087.61 and 418.12

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Solution

The fourth proportional to 1,391.95, 2,087.61 and 418.12 is: 627.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,391.95 : 2,087.61 = 418.12 : x
  2. Step 2: Convert to fraction form
    1,391.95/2,087.61 = 418.12/x
  3. Step 3: Cross multiply
    1,391.95x = 2,087.61 × 418.12
  4. Step 4: Simplify right side
    1,391.95x = 872,871.49
  5. Step 5: Solve for x
    x = 872,871.49/1,391.95
  6. Step 6: Final answer
    x = 627.09

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.