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Finding the Fourth Proportional to 1,692.64, 2,540.16 and 826.72

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Solution

The fourth proportional to 1,692.64, 2,540.16 and 826.72 is: 1,240.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,692.64 : 2,540.16 = 826.72 : x
  2. Step 2: Convert to fraction form
    1,692.64/2,540.16 = 826.72/x
  3. Step 3: Cross multiply
    1,692.64x = 2,540.16 × 826.72
  4. Step 4: Simplify right side
    1,692.64x = 2,100,001.08
  5. Step 5: Solve for x
    x = 2,100,001.08/1,692.64
  6. Step 6: Final answer
    x = 1,240.67

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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.