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Finding the Fourth Proportional to 1,214.80, 1,818.54 and 1,099.30

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Solution

The fourth proportional to 1,214.80, 1,818.54 and 1,099.30 is: 1,645.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,214.80 : 1,818.54 = 1,099.30 : x
  2. Step 2: Convert to fraction form
    1,214.80/1,818.54 = 1,099.30/x
  3. Step 3: Cross multiply
    1,214.80x = 1,818.54 × 1,099.30
  4. Step 4: Simplify right side
    1,214.80x = 1,999,121.02
  5. Step 5: Solve for x
    x = 1,999,121.02/1,214.80
  6. Step 6: Final answer
    x = 1,645.64

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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.