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Finding the Fourth Proportional to 9,990.84, 14,981.90 and 5,309.73

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Solution

The fourth proportional to 9,990.84, 14,981.90 and 5,309.73 is: 7,962.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,990.84 : 14,981.90 = 5,309.73 : x
  2. Step 2: Convert to fraction form
    9,990.84/14,981.90 = 5,309.73/x
  3. Step 3: Cross multiply
    9,990.84x = 14,981.90 × 5,309.73
  4. Step 4: Simplify right side
    9,990.84x = 79,549,775.20
  5. Step 5: Solve for x
    x = 79,549,775.20/9,990.84
  6. Step 6: Final answer
    x = 7,962.27

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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.