Home / 20,665.17-28,512.95-13,108.75

Finding the Fourth Proportional to 20,665.17, 28,512.95 and 13,108.75

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Solution

The fourth proportional to 20,665.17, 28,512.95 and 13,108.75 is: 18,086.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,665.17 : 28,512.95 = 13,108.75 : x
  2. Step 2: Convert to fraction form
    20,665.17/28,512.95 = 13,108.75/x
  3. Step 3: Cross multiply
    20,665.17x = 28,512.95 × 13,108.75
  4. Step 4: Simplify right side
    20,665.17x = 373,768,996.49
  5. Step 5: Solve for x
    x = 373,768,996.49/20,665.17
  6. Step 6: Final answer
    x = 18,086.91

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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.