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Finding the Fourth Proportional to 1,214.21, 1,819.58 and 693.14

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Solution

The fourth proportional to 1,214.21, 1,819.58 and 693.14 is: 1,038.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,214.21 : 1,819.58 = 693.14 : x
  2. Step 2: Convert to fraction form
    1,214.21/1,819.58 = 693.14/x
  3. Step 3: Cross multiply
    1,214.21x = 1,819.58 × 693.14
  4. Step 4: Simplify right side
    1,214.21x = 1,261,211.12
  5. Step 5: Solve for x
    x = 1,261,211.12/1,214.21
  6. Step 6: Final answer
    x = 1,038.71

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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.