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Finding the Fourth Proportional to 20,357.88, 28,095.12 and 11,405.94

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Solution

The fourth proportional to 20,357.88, 28,095.12 and 11,405.94 is: 15,740.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,357.88 : 28,095.12 = 11,405.94 : x
  2. Step 2: Convert to fraction form
    20,357.88/28,095.12 = 11,405.94/x
  3. Step 3: Cross multiply
    20,357.88x = 28,095.12 × 11,405.94
  4. Step 4: Simplify right side
    20,357.88x = 320,451,253.01
  5. Step 5: Solve for x
    x = 320,451,253.01/20,357.88
  6. Step 6: Final answer
    x = 15,740.90

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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.