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Finding the Fourth Proportional to 928.77, 1,391.93 and 380.31

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Solution

The fourth proportional to 928.77, 1,391.93 and 380.31 is: 569.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    928.77 : 1,391.93 = 380.31 : x
  2. Step 2: Convert to fraction form
    928.77/1,391.93 = 380.31/x
  3. Step 3: Cross multiply
    928.77x = 1,391.93 × 380.31
  4. Step 4: Simplify right side
    928.77x = 529,364.90
  5. Step 5: Solve for x
    x = 529,364.90/928.77
  6. Step 6: Final answer
    x = 569.96

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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.