Home / 10,661.40-15,986.10-4,087.80

Finding the Fourth Proportional to 10,661.40, 15,986.10 and 4,087.80

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Solution

The fourth proportional to 10,661.40, 15,986.10 and 4,087.80 is: 6,129.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,661.40 : 15,986.10 = 4,087.80 : x
  2. Step 2: Convert to fraction form
    10,661.40/15,986.10 = 4,087.80/x
  3. Step 3: Cross multiply
    10,661.40x = 15,986.10 × 4,087.80
  4. Step 4: Simplify right side
    10,661.40x = 65,347,979.58
  5. Step 5: Solve for x
    x = 65,347,979.58/10,661.40
  6. Step 6: Final answer
    x = 6,129.40

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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.