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Finding the Fourth Proportional to 1,029.38, 1,421.15 and 680.67

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Solution

The fourth proportional to 1,029.38, 1,421.15 and 680.67 is: 939.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,029.38 : 1,421.15 = 680.67 : x
  2. Step 2: Convert to fraction form
    1,029.38/1,421.15 = 680.67/x
  3. Step 3: Cross multiply
    1,029.38x = 1,421.15 × 680.67
  4. Step 4: Simplify right side
    1,029.38x = 967,330.77
  5. Step 5: Solve for x
    x = 967,330.77/1,029.38
  6. Step 6: Final answer
    x = 939.73

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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.