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Finding the Fourth Proportional to 7,140.99, 9,855.50 and 3,998.19

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Solution

The fourth proportional to 7,140.99, 9,855.50 and 3,998.19 is: 5,518.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,140.99 : 9,855.50 = 3,998.19 : x
  2. Step 2: Convert to fraction form
    7,140.99/9,855.50 = 3,998.19/x
  3. Step 3: Cross multiply
    7,140.99x = 9,855.50 × 3,998.19
  4. Step 4: Simplify right side
    7,140.99x = 39,404,141.55
  5. Step 5: Solve for x
    x = 39,404,141.55/7,140.99
  6. Step 6: Final answer
    x = 5,518.02

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Half scale
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Double scale
Find fourth proportional to 7,141.99, 9,856.88 and 3,999.19
Similar ratio
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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.