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Finding the Fourth Proportional to 928.23, 1,391.43 and 380.55

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Solution

The fourth proportional to 928.23, 1,391.43 and 380.55 is: 570.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    928.23 : 1,391.43 = 380.55 : x
  2. Step 2: Convert to fraction form
    928.23/1,391.43 = 380.55/x
  3. Step 3: Cross multiply
    928.23x = 1,391.43 × 380.55
  4. Step 4: Simplify right side
    928.23x = 529,508.69
  5. Step 5: Solve for x
    x = 529,508.69/928.23
  6. Step 6: Final answer
    x = 570.45

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1.5x scale

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.