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Finding the Fourth Proportional to 8,990.94, 12,396.47 and 7,392

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Solution

The fourth proportional to 8,990.94, 12,396.47 and 7,392 is: 10,191.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,990.94 : 12,396.47 = 7,392 : x
  2. Step 2: Convert to fraction form
    8,990.94/12,396.47 = 7,392/x
  3. Step 3: Cross multiply
    8,990.94x = 12,396.47 × 7,392
  4. Step 4: Simplify right side
    8,990.94x = 91,634,669.28
  5. Step 5: Solve for x
    x = 91,634,669.28/8,990.94
  6. Step 6: Final answer
    x = 10,191.89

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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.