Home / 7,989.89-11,985.87-4,287.05

Finding the Fourth Proportional to 7,989.89, 11,985.87 and 4,287.05

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Solution

The fourth proportional to 7,989.89, 11,985.87 and 4,287.05 is: 6,431.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,989.89 : 11,985.87 = 4,287.05 : x
  2. Step 2: Convert to fraction form
    7,989.89/11,985.87 = 4,287.05/x
  3. Step 3: Cross multiply
    7,989.89x = 11,985.87 × 4,287.05
  4. Step 4: Simplify right side
    7,989.89x = 51,383,964.05
  5. Step 5: Solve for x
    x = 51,383,964.05/7,989.89
  6. Step 6: Final answer
    x = 6,431.13

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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.