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Finding the Fourth Proportional to 818.51, 1,128.96 and 503.55

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Solution

The fourth proportional to 818.51, 1,128.96 and 503.55 is: 694.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.51 : 1,128.96 = 503.55 : x
  2. Step 2: Convert to fraction form
    818.51/1,128.96 = 503.55/x
  3. Step 3: Cross multiply
    818.51x = 1,128.96 × 503.55
  4. Step 4: Simplify right side
    818.51x = 568,487.81
  5. Step 5: Solve for x
    x = 568,487.81/818.51
  6. Step 6: Final answer
    x = 694.54

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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.