Home / 20,681.76-28,546.08-13,242.72

Finding the Fourth Proportional to 20,681.76, 28,546.08 and 13,242.72

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Solution

The fourth proportional to 20,681.76, 28,546.08 and 13,242.72 is: 18,278.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,681.76 : 28,546.08 = 13,242.72 : x
  2. Step 2: Convert to fraction form
    20,681.76/28,546.08 = 13,242.72/x
  3. Step 3: Cross multiply
    20,681.76x = 28,546.08 × 13,242.72
  4. Step 4: Simplify right side
    20,681.76x = 378,027,744.54
  5. Step 5: Solve for x
    x = 378,027,744.54/20,681.76
  6. Step 6: Final answer
    x = 18,278.32

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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.