Home / 20,858.81-31,290.35-7,708.12

Finding the Fourth Proportional to 20,858.81, 31,290.35 and 7,708.12

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Solution

The fourth proportional to 20,858.81, 31,290.35 and 7,708.12 is: 11,562.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,858.81 : 31,290.35 = 7,708.12 : x
  2. Step 2: Convert to fraction form
    20,858.81/31,290.35 = 7,708.12/x
  3. Step 3: Cross multiply
    20,858.81x = 31,290.35 × 7,708.12
  4. Step 4: Simplify right side
    20,858.81x = 241,189,655.88
  5. Step 5: Solve for x
    x = 241,189,655.88/20,858.81
  6. Step 6: Final answer
    x = 11,562.97

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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.