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Finding the Fourth Proportional to 20,419.88, 30,611.98 and 7,931.32

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Solution

The fourth proportional to 20,419.88, 30,611.98 and 7,931.32 is: 11,890.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,419.88 : 30,611.98 = 7,931.32 : x
  2. Step 2: Convert to fraction form
    20,419.88/30,611.98 = 7,931.32/x
  3. Step 3: Cross multiply
    20,419.88x = 30,611.98 × 7,931.32
  4. Step 4: Simplify right side
    20,419.88x = 242,793,409.21
  5. Step 5: Solve for x
    x = 242,793,409.21/20,419.88
  6. Step 6: Final answer
    x = 11,890.05

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1.5x scale

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.