Home / 20,941.28-28,905.70-13,407.90

Finding the Fourth Proportional to 20,941.28, 28,905.70 and 13,407.90

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Solution

The fourth proportional to 20,941.28, 28,905.70 and 13,407.90 is: 18,507.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,941.28 : 28,905.70 = 13,407.90 : x
  2. Step 2: Convert to fraction form
    20,941.28/28,905.70 = 13,407.90/x
  3. Step 3: Cross multiply
    20,941.28x = 28,905.70 × 13,407.90
  4. Step 4: Simplify right side
    20,941.28x = 387,564,523.46
  5. Step 5: Solve for x
    x = 387,564,523.46/20,941.28
  6. Step 6: Final answer
    x = 18,507.21

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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.