Home / 20,993.16-28,971.87-11,561.72

Finding the Fourth Proportional to 20,993.16, 28,971.87 and 11,561.72

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Solution

The fourth proportional to 20,993.16, 28,971.87 and 11,561.72 is: 15,955.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,993.16 : 28,971.87 = 11,561.72 : x
  2. Step 2: Convert to fraction form
    20,993.16/28,971.87 = 11,561.72/x
  3. Step 3: Cross multiply
    20,993.16x = 28,971.87 × 11,561.72
  4. Step 4: Simplify right side
    20,993.16x = 334,964,648.82
  5. Step 5: Solve for x
    x = 334,964,648.82/20,993.16
  6. Step 6: Final answer
    x = 15,955.89

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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.