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Finding the Fourth Proportional to 928.08, 1,392.28 and 517.68

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Solution

The fourth proportional to 928.08, 1,392.28 and 517.68 is: 776.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    928.08 : 1,392.28 = 517.68 : x
  2. Step 2: Convert to fraction form
    928.08/1,392.28 = 517.68/x
  3. Step 3: Cross multiply
    928.08x = 1,392.28 × 517.68
  4. Step 4: Simplify right side
    928.08x = 720,755.51
  5. Step 5: Solve for x
    x = 720,755.51/928.08
  6. Step 6: Final answer
    x = 776.61

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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.