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Finding the Fourth Proportional to 7,172.82, 9,898.98 and 3,986.58

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Solution

The fourth proportional to 7,172.82, 9,898.98 and 3,986.58 is: 5,501.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,172.82 : 9,898.98 = 3,986.58 : x
  2. Step 2: Convert to fraction form
    7,172.82/9,898.98 = 3,986.58/x
  3. Step 3: Cross multiply
    7,172.82x = 9,898.98 × 3,986.58
  4. Step 4: Simplify right side
    7,172.82x = 39,463,075.69
  5. Step 5: Solve for x
    x = 39,463,075.69/7,172.82
  6. Step 6: Final answer
    x = 5,501.75

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1.5x scale

Why These Related Problems?

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