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Finding the Fourth Proportional to 20,609.72, 28,420 and 17,635.40

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Solution

The fourth proportional to 20,609.72, 28,420 and 17,635.40 is: 24,318.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,609.72 : 28,420 = 17,635.40 : x
  2. Step 2: Convert to fraction form
    20,609.72/28,420 = 17,635.40/x
  3. Step 3: Cross multiply
    20,609.72x = 28,420 × 17,635.40
  4. Step 4: Simplify right side
    20,609.72x = 501,198,068.00
  5. Step 5: Solve for x
    x = 501,198,068.00/20,609.72
  6. Step 6: Final answer
    x = 24,318.53

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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.