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Finding the Fourth Proportional to 1,284.21, 1,925.87 and 418.32

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Solution

The fourth proportional to 1,284.21, 1,925.87 and 418.32 is: 627.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,284.21 : 1,925.87 = 418.32 : x
  2. Step 2: Convert to fraction form
    1,284.21/1,925.87 = 418.32/x
  3. Step 3: Cross multiply
    1,284.21x = 1,925.87 × 418.32
  4. Step 4: Simplify right side
    1,284.21x = 805,627.85
  5. Step 5: Solve for x
    x = 805,627.85/1,284.21
  6. Step 6: Final answer
    x = 627.33

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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.