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Finding the Fourth Proportional to 9,990, 14,985 and 5,059.80

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Solution

The fourth proportional to 9,990, 14,985 and 5,059.80 is: 7,589.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,990 : 14,985 = 5,059.80 : x
  2. Step 2: Convert to fraction form
    9,990/14,985 = 5,059.80/x
  3. Step 3: Cross multiply
    9,990x = 14,985 × 5,059.80
  4. Step 4: Simplify right side
    9,990x = 75,821,103
  5. Step 5: Solve for x
    x = 75,821,103/9,990
  6. Step 6: Final answer
    x = 7,589.70

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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.