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Finding the Fourth Proportional to 1,956.34, 2,699.81 and 1,072.20

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Solution

The fourth proportional to 1,956.34, 2,699.81 and 1,072.20 is: 1,479.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,956.34 : 2,699.81 = 1,072.20 : x
  2. Step 2: Convert to fraction form
    1,956.34/2,699.81 = 1,072.20/x
  3. Step 3: Cross multiply
    1,956.34x = 2,699.81 × 1,072.20
  4. Step 4: Simplify right side
    1,956.34x = 2,894,730.66
  5. Step 5: Solve for x
    x = 2,894,730.66/1,956.34
  6. Step 6: Final answer
    x = 1,479.67

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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.