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Finding the Fourth Proportional to 928.31, 1,392.48 and 401.17

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Solution

The fourth proportional to 928.31, 1,392.48 and 401.17 is: 601.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    928.31 : 1,392.48 = 401.17 : x
  2. Step 2: Convert to fraction form
    928.31/1,392.48 = 401.17/x
  3. Step 3: Cross multiply
    928.31x = 1,392.48 × 401.17
  4. Step 4: Simplify right side
    928.31x = 558,612.23
  5. Step 5: Solve for x
    x = 558,612.23/928.31
  6. Step 6: Final answer
    x = 601.75

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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.