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Finding the Fourth Proportional to 9,990.51, 13,790.12 and 6,450.99

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Solution

The fourth proportional to 9,990.51, 13,790.12 and 6,450.99 is: 8,904.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,990.51 : 13,790.12 = 6,450.99 : x
  2. Step 2: Convert to fraction form
    9,990.51/13,790.12 = 6,450.99/x
  3. Step 3: Cross multiply
    9,990.51x = 13,790.12 × 6,450.99
  4. Step 4: Simplify right side
    9,990.51x = 88,959,926.22
  5. Step 5: Solve for x
    x = 88,959,926.22/9,990.51
  6. Step 6: Final answer
    x = 8,904.44

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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.