Home / 20,764.40-31,157.40-9,078.80

Finding the Fourth Proportional to 20,764.40, 31,157.40 and 9,078.80

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Solution

The fourth proportional to 20,764.40, 31,157.40 and 9,078.80 is: 13,622.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,764.40 : 31,157.40 = 9,078.80 : x
  2. Step 2: Convert to fraction form
    20,764.40/31,157.40 = 9,078.80/x
  3. Step 3: Cross multiply
    20,764.40x = 31,157.40 × 9,078.80
  4. Step 4: Simplify right side
    20,764.40x = 282,871,803.12
  5. Step 5: Solve for x
    x = 282,871,803.12/20,764.40
  6. Step 6: Final answer
    x = 13,622.92

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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.