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Finding the Fourth Proportional to 7,131.53, 9,842.20 and 3,987.72

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Solution

The fourth proportional to 7,131.53, 9,842.20 and 3,987.72 is: 5,503.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,131.53 : 9,842.20 = 3,987.72 : x
  2. Step 2: Convert to fraction form
    7,131.53/9,842.20 = 3,987.72/x
  3. Step 3: Cross multiply
    7,131.53x = 9,842.20 × 3,987.72
  4. Step 4: Simplify right side
    7,131.53x = 39,247,937.78
  5. Step 5: Solve for x
    x = 39,247,937.78/7,131.53
  6. Step 6: Final answer
    x = 5,503.44

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.