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Finding the Fourth Proportional to 1,147.35, 1,721 and 281.67

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Solution

The fourth proportional to 1,147.35, 1,721 and 281.67 is: 422.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,147.35 : 1,721 = 281.67 : x
  2. Step 2: Convert to fraction form
    1,147.35/1,721 = 281.67/x
  3. Step 3: Cross multiply
    1,147.35x = 1,721 × 281.67
  4. Step 4: Simplify right side
    1,147.35x = 484,754.07
  5. Step 5: Solve for x
    x = 484,754.07/1,147.35
  6. Step 6: Final answer
    x = 422.50

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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.