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Finding the Fourth Proportional to 928.45, 1,391.48 and 379.98

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Solution

The fourth proportional to 928.45, 1,391.48 and 379.98 is: 569.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    928.45 : 1,391.48 = 379.98 : x
  2. Step 2: Convert to fraction form
    928.45/1,391.48 = 379.98/x
  3. Step 3: Cross multiply
    928.45x = 1,391.48 × 379.98
  4. Step 4: Simplify right side
    928.45x = 528,734.57
  5. Step 5: Solve for x
    x = 528,734.57/928.45
  6. Step 6: Final answer
    x = 569.48

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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.