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Finding the Fourth Proportional to 13,990.12, 20,965.39 and 7,752.99

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Solution

The fourth proportional to 13,990.12, 20,965.39 and 7,752.99 is: 11,618.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,990.12 : 20,965.39 = 7,752.99 : x
  2. Step 2: Convert to fraction form
    13,990.12/20,965.39 = 7,752.99/x
  3. Step 3: Cross multiply
    13,990.12x = 20,965.39 × 7,752.99
  4. Step 4: Simplify right side
    13,990.12x = 162,544,459.02
  5. Step 5: Solve for x
    x = 162,544,459.02/13,990.12
  6. Step 6: Final answer
    x = 11,618.52

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1.5x scale

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.