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Finding the Fourth Proportional to 818.77, 1,228.45 and 380.23

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Solution

The fourth proportional to 818.77, 1,228.45 and 380.23 is: 570.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.77 : 1,228.45 = 380.23 : x
  2. Step 2: Convert to fraction form
    818.77/1,228.45 = 380.23/x
  3. Step 3: Cross multiply
    818.77x = 1,228.45 × 380.23
  4. Step 4: Simplify right side
    818.77x = 467,093.54
  5. Step 5: Solve for x
    x = 467,093.54/818.77
  6. Step 6: Final answer
    x = 570.48

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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.