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Finding the Fourth Proportional to 20,487.30, 30,709.35 and 11,703.30

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Solution

The fourth proportional to 20,487.30, 30,709.35 and 11,703.30 is: 17,542.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,487.30 : 30,709.35 = 11,703.30 : x
  2. Step 2: Convert to fraction form
    20,487.30/30,709.35 = 11,703.30/x
  3. Step 3: Cross multiply
    20,487.30x = 30,709.35 × 11,703.30
  4. Step 4: Simplify right side
    20,487.30x = 359,400,735.86
  5. Step 5: Solve for x
    x = 359,400,735.86/20,487.30
  6. Step 6: Final answer
    x = 17,542.61

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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.