Home / 20,421.45-28,210.28-15,765.57

Finding the Fourth Proportional to 20,421.45, 28,210.28 and 15,765.57

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Solution

The fourth proportional to 20,421.45, 28,210.28 and 15,765.57 is: 21,778.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,421.45 : 28,210.28 = 15,765.57 : x
  2. Step 2: Convert to fraction form
    20,421.45/28,210.28 = 15,765.57/x
  3. Step 3: Cross multiply
    20,421.45x = 28,210.28 × 15,765.57
  4. Step 4: Simplify right side
    20,421.45x = 444,751,065.23
  5. Step 5: Solve for x
    x = 444,751,065.23/20,421.45
  6. Step 6: Final answer
    x = 21,778.62

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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.