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Finding the Fourth Proportional to 27,978.55, 38,645.06 and 20,309.57

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Solution

The fourth proportional to 27,978.55, 38,645.06 and 20,309.57 is: 28,052.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    27,978.55 : 38,645.06 = 20,309.57 : x
  2. Step 2: Convert to fraction form
    27,978.55/38,645.06 = 20,309.57/x
  3. Step 3: Cross multiply
    27,978.55x = 38,645.06 × 20,309.57
  4. Step 4: Simplify right side
    27,978.55x = 784,864,401.37
  5. Step 5: Solve for x
    x = 784,864,401.37/27,978.55
  6. Step 6: Final answer
    x = 28,052.36

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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.