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Finding the Fourth Proportional to 9,989.60, 14,989.80 and 4,443.80

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Solution

The fourth proportional to 9,989.60, 14,989.80 and 4,443.80 is: 6,668.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,989.60 : 14,989.80 = 4,443.80 : x
  2. Step 2: Convert to fraction form
    9,989.60/14,989.80 = 4,443.80/x
  3. Step 3: Cross multiply
    9,989.60x = 14,989.80 × 4,443.80
  4. Step 4: Simplify right side
    9,989.60x = 66,611,673.24
  5. Step 5: Solve for x
    x = 66,611,673.24/9,989.60
  6. Step 6: Final answer
    x = 6,668.10

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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.