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Finding the Fourth Proportional to 1,147.70, 1,721.55 and 367.70

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Solution

The fourth proportional to 1,147.70, 1,721.55 and 367.70 is: 551.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,147.70 : 1,721.55 = 367.70 : x
  2. Step 2: Convert to fraction form
    1,147.70/1,721.55 = 367.70/x
  3. Step 3: Cross multiply
    1,147.70x = 1,721.55 × 367.70
  4. Step 4: Simplify right side
    1,147.70x = 633,013.94
  5. Step 5: Solve for x
    x = 633,013.94/1,147.70
  6. Step 6: Final answer
    x = 551.55

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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.