Home / 20,428.71-28,202.37-13,749.45

Finding the Fourth Proportional to 20,428.71, 28,202.37 and 13,749.45

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Solution

The fourth proportional to 20,428.71, 28,202.37 and 13,749.45 is: 18,981.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,428.71 : 28,202.37 = 13,749.45 : x
  2. Step 2: Convert to fraction form
    20,428.71/28,202.37 = 13,749.45/x
  3. Step 3: Cross multiply
    20,428.71x = 28,202.37 × 13,749.45
  4. Step 4: Simplify right side
    20,428.71x = 387,767,076.20
  5. Step 5: Solve for x
    x = 387,767,076.20/20,428.71
  6. Step 6: Final answer
    x = 18,981.48

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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.