Home / 20,986.39-28,999.82-15,311.53

Finding the Fourth Proportional to 20,986.39, 28,999.82 and 15,311.53

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Solution

The fourth proportional to 20,986.39, 28,999.82 and 15,311.53 is: 21,158.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,986.39 : 28,999.82 = 15,311.53 : x
  2. Step 2: Convert to fraction form
    20,986.39/28,999.82 = 15,311.53/x
  3. Step 3: Cross multiply
    20,986.39x = 28,999.82 × 15,311.53
  4. Step 4: Simplify right side
    20,986.39x = 444,031,688.45
  5. Step 5: Solve for x
    x = 444,031,688.45/20,986.39
  6. Step 6: Final answer
    x = 21,158.08

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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.