Home / 20,965.21-28,931.75-15,611.60

Finding the Fourth Proportional to 20,965.21, 28,931.75 and 15,611.60

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Solution

The fourth proportional to 20,965.21, 28,931.75 and 15,611.60 is: 21,543.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,965.21 : 28,931.75 = 15,611.60 : x
  2. Step 2: Convert to fraction form
    20,965.21/28,931.75 = 15,611.60/x
  3. Step 3: Cross multiply
    20,965.21x = 28,931.75 × 15,611.60
  4. Step 4: Simplify right side
    20,965.21x = 451,670,961.11
  5. Step 5: Solve for x
    x = 451,670,961.11/20,965.21
  6. Step 6: Final answer
    x = 21,543.83

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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.