Home / 20,778.81-28,686.41-13,717.64

Finding the Fourth Proportional to 20,778.81, 28,686.41 and 13,717.64

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Solution

The fourth proportional to 20,778.81, 28,686.41 and 13,717.64 is: 18,938.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,778.81 : 28,686.41 = 13,717.64 : x
  2. Step 2: Convert to fraction form
    20,778.81/28,686.41 = 13,717.64/x
  3. Step 3: Cross multiply
    20,778.81x = 28,686.41 × 13,717.64
  4. Step 4: Simplify right side
    20,778.81x = 393,509,633.25
  5. Step 5: Solve for x
    x = 393,509,633.25/20,778.81
  6. Step 6: Final answer
    x = 18,938.03

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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.