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Finding the Fourth Proportional to 9,989.80, 15,000.90 and 7,235.80

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Solution

The fourth proportional to 9,989.80, 15,000.90 and 7,235.80 is: 10,865.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,989.80 : 15,000.90 = 7,235.80 : x
  2. Step 2: Convert to fraction form
    9,989.80/15,000.90 = 7,235.80/x
  3. Step 3: Cross multiply
    9,989.80x = 15,000.90 × 7,235.80
  4. Step 4: Simplify right side
    9,989.80x = 108,543,512.22
  5. Step 5: Solve for x
    x = 108,543,512.22/9,989.80
  6. Step 6: Final answer
    x = 10,865.43

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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.