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Finding the Fourth Proportional to 1,391.47, 2,087.21 and 418.25

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Solution

The fourth proportional to 1,391.47, 2,087.21 and 418.25 is: 627.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,391.47 : 2,087.21 = 418.25 : x
  2. Step 2: Convert to fraction form
    1,391.47/2,087.21 = 418.25/x
  3. Step 3: Cross multiply
    1,391.47x = 2,087.21 × 418.25
  4. Step 4: Simplify right side
    1,391.47x = 872,978.71
  5. Step 5: Solve for x
    x = 872,978.71/1,391.47
  6. Step 6: Final answer
    x = 627.38

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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.