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Finding the Fourth Proportional to 20,941.62, 28,892.22 and 12,980.94

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Solution

The fourth proportional to 20,941.62, 28,892.22 and 12,980.94 is: 17,909.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,941.62 : 28,892.22 = 12,980.94 : x
  2. Step 2: Convert to fraction form
    20,941.62/28,892.22 = 12,980.94/x
  3. Step 3: Cross multiply
    20,941.62x = 28,892.22 × 12,980.94
  4. Step 4: Simplify right side
    20,941.62x = 375,048,174.29
  5. Step 5: Solve for x
    x = 375,048,174.29/20,941.62
  6. Step 6: Final answer
    x = 17,909.22

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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.