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Finding the Fourth Proportional to 1,211.81, 1,818.16 and 725.20

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Solution

The fourth proportional to 1,211.81, 1,818.16 and 725.20 is: 1,088.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,211.81 : 1,818.16 = 725.20 : x
  2. Step 2: Convert to fraction form
    1,211.81/1,818.16 = 725.20/x
  3. Step 3: Cross multiply
    1,211.81x = 1,818.16 × 725.20
  4. Step 4: Simplify right side
    1,211.81x = 1,318,523.27
  5. Step 5: Solve for x
    x = 1,318,523.27/1,211.81
  6. Step 6: Final answer
    x = 1,088.07

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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.