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Finding the Fourth Proportional to 7,128.87, 10,687.53 and 2,971.99

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Solution

The fourth proportional to 7,128.87, 10,687.53 and 2,971.99 is: 4,455.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,128.87 : 10,687.53 = 2,971.99 : x
  2. Step 2: Convert to fraction form
    7,128.87/10,687.53 = 2,971.99/x
  3. Step 3: Cross multiply
    7,128.87x = 10,687.53 × 2,971.99
  4. Step 4: Simplify right side
    7,128.87x = 31,763,232.28
  5. Step 5: Solve for x
    x = 31,763,232.28/7,128.87
  6. Step 6: Final answer
    x = 4,455.58

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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.