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Finding the Fourth Proportional to 818.84, 1,230.96 and 758.72

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Solution

The fourth proportional to 818.84, 1,230.96 and 758.72 is: 1,140.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.84 : 1,230.96 = 758.72 : x
  2. Step 2: Convert to fraction form
    818.84/1,230.96 = 758.72/x
  3. Step 3: Cross multiply
    818.84x = 1,230.96 × 758.72
  4. Step 4: Simplify right side
    818.84x = 933,953.97
  5. Step 5: Solve for x
    x = 933,953.97/818.84
  6. Step 6: Final answer
    x = 1,140.58

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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.