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Finding the Fourth Proportional to 1,318.17, 1,818.96 and 820.43

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Solution

The fourth proportional to 1,318.17, 1,818.96 and 820.43 is: 1,132.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,318.17 : 1,818.96 = 820.43 : x
  2. Step 2: Convert to fraction form
    1,318.17/1,818.96 = 820.43/x
  3. Step 3: Cross multiply
    1,318.17x = 1,818.96 × 820.43
  4. Step 4: Simplify right side
    1,318.17x = 1,492,324.00
  5. Step 5: Solve for x
    x = 1,492,324.00/1,318.17
  6. Step 6: Final answer
    x = 1,132.11

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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.