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Finding the Fourth Proportional to 928.51, 1,392.81 and 279.19

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Solution

The fourth proportional to 928.51, 1,392.81 and 279.19 is: 418.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    928.51 : 1,392.81 = 279.19 : x
  2. Step 2: Convert to fraction form
    928.51/1,392.81 = 279.19/x
  3. Step 3: Cross multiply
    928.51x = 1,392.81 × 279.19
  4. Step 4: Simplify right side
    928.51x = 388,855.14
  5. Step 5: Solve for x
    x = 388,855.14/928.51
  6. Step 6: Final answer
    x = 418.80

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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.