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Finding the Fourth Proportional to 3,791, 5,686.50 and 1,055

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Solution

The fourth proportional to 3,791, 5,686.50 and 1,055 is: 1,582.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,791 : 5,686.50 = 1,055 : x
  2. Step 2: Convert to fraction form
    3,791/5,686.50 = 1,055/x
  3. Step 3: Cross multiply
    3,791x = 5,686.50 × 1,055
  4. Step 4: Simplify right side
    3,791x = 5,999,257.50
  5. Step 5: Solve for x
    x = 5,999,257.50/3,791
  6. Step 6: Final answer
    x = 1,582.50

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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.