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Finding the Fourth Proportional to 3,126.50, 4,689.80 and 818

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Solution

The fourth proportional to 3,126.50, 4,689.80 and 818 is: 1,227.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,126.50 : 4,689.80 = 818 : x
  2. Step 2: Convert to fraction form
    3,126.50/4,689.80 = 818/x
  3. Step 3: Cross multiply
    3,126.50x = 4,689.80 × 818
  4. Step 4: Simplify right side
    3,126.50x = 3,836,256.40
  5. Step 5: Solve for x
    x = 3,836,256.40/3,126.50
  6. Step 6: Final answer
    x = 1,227.01

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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.