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Finding the Fourth Proportional to 818.32, 1,128.90 and 503.44

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Solution

The fourth proportional to 818.32, 1,128.90 and 503.44 is: 694.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.32 : 1,128.90 = 503.44 : x
  2. Step 2: Convert to fraction form
    818.32/1,128.90 = 503.44/x
  3. Step 3: Cross multiply
    818.32x = 1,128.90 × 503.44
  4. Step 4: Simplify right side
    818.32x = 568,333.42
  5. Step 5: Solve for x
    x = 568,333.42/818.32
  6. Step 6: Final answer
    x = 694.51

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.