Home / 18,765.45-28,139.87-5,615.30

Finding the Fourth Proportional to 18,765.45, 28,139.87 and 5,615.30

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Solution

The fourth proportional to 18,765.45, 28,139.87 and 5,615.30 is: 8,420.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,765.45 : 28,139.87 = 5,615.30 : x
  2. Step 2: Convert to fraction form
    18,765.45/28,139.87 = 5,615.30/x
  3. Step 3: Cross multiply
    18,765.45x = 28,139.87 × 5,615.30
  4. Step 4: Simplify right side
    18,765.45x = 158,013,896.40
  5. Step 5: Solve for x
    x = 158,013,896.40/18,765.45
  6. Step 6: Final answer
    x = 8,420.47

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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.