Home / 20,945.15-28,911.05-13,411.78

Finding the Fourth Proportional to 20,945.15, 28,911.05 and 13,411.78

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Solution

The fourth proportional to 20,945.15, 28,911.05 and 13,411.78 is: 18,512.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,945.15 : 28,911.05 = 13,411.78 : x
  2. Step 2: Convert to fraction form
    20,945.15/28,911.05 = 13,411.78/x
  3. Step 3: Cross multiply
    20,945.15x = 28,911.05 × 13,411.78
  4. Step 4: Simplify right side
    20,945.15x = 387,748,553.13
  5. Step 5: Solve for x
    x = 387,748,553.13/20,945.15
  6. Step 6: Final answer
    x = 18,512.57

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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.