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Finding the Fourth Proportional to 20,310.21, 28,030.70 and 11,358.21

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Solution

The fourth proportional to 20,310.21, 28,030.70 and 11,358.21 is: 15,675.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,310.21 : 28,030.70 = 11,358.21 : x
  2. Step 2: Convert to fraction form
    20,310.21/28,030.70 = 11,358.21/x
  3. Step 3: Cross multiply
    20,310.21x = 28,030.70 × 11,358.21
  4. Step 4: Simplify right side
    20,310.21x = 318,378,577.05
  5. Step 5: Solve for x
    x = 318,378,577.05/20,310.21
  6. Step 6: Final answer
    x = 15,675.79

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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.