Home / 20,770.96-28,655.70-13,215.28

Finding the Fourth Proportional to 20,770.96, 28,655.70 and 13,215.28

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Solution

The fourth proportional to 20,770.96, 28,655.70 and 13,215.28 is: 18,231.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,770.96 : 28,655.70 = 13,215.28 : x
  2. Step 2: Convert to fraction form
    20,770.96/28,655.70 = 13,215.28/x
  3. Step 3: Cross multiply
    20,770.96x = 28,655.70 × 13,215.28
  4. Step 4: Simplify right side
    20,770.96x = 378,693,099.10
  5. Step 5: Solve for x
    x = 378,693,099.10/20,770.96
  6. Step 6: Final answer
    x = 18,231.85

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.