Home / 21,190.28-31,779.36-8,540

Finding the Fourth Proportional to 21,190.28, 31,779.36 and 8,540

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Solution

The fourth proportional to 21,190.28, 31,779.36 and 8,540 is: 12,807.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,190.28 : 31,779.36 = 8,540 : x
  2. Step 2: Convert to fraction form
    21,190.28/31,779.36 = 8,540/x
  3. Step 3: Cross multiply
    21,190.28x = 31,779.36 × 8,540
  4. Step 4: Simplify right side
    21,190.28x = 271,395,734.40
  5. Step 5: Solve for x
    x = 271,395,734.40/21,190.28
  6. Step 6: Final answer
    x = 12,807.56

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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.