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Finding the Fourth Proportional to 928.53, 1,392.80 and 279.18

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Solution

The fourth proportional to 928.53, 1,392.80 and 279.18 is: 418.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    928.53 : 1,392.80 = 279.18 : x
  2. Step 2: Convert to fraction form
    928.53/1,392.80 = 279.18/x
  3. Step 3: Cross multiply
    928.53x = 1,392.80 × 279.18
  4. Step 4: Simplify right side
    928.53x = 388,840.51
  5. Step 5: Solve for x
    x = 388,840.51/928.53
  6. Step 6: Final answer
    x = 418.77

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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.