Home / 20,886.79-31,338.39-9,191.81

Finding the Fourth Proportional to 20,886.79, 31,338.39 and 9,191.81

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Solution

The fourth proportional to 20,886.79, 31,338.39 and 9,191.81 is: 13,791.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,886.79 : 31,338.39 = 9,191.81 : x
  2. Step 2: Convert to fraction form
    20,886.79/31,338.39 = 9,191.81/x
  3. Step 3: Cross multiply
    20,886.79x = 31,338.39 × 9,191.81
  4. Step 4: Simplify right side
    20,886.79x = 288,056,323.93
  5. Step 5: Solve for x
    x = 288,056,323.93/20,886.79
  6. Step 6: Final answer
    x = 13,791.32

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.