Home / 20,837.30-28,756.16-11,405.87

Finding the Fourth Proportional to 20,837.30, 28,756.16 and 11,405.87

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Solution

The fourth proportional to 20,837.30, 28,756.16 and 11,405.87 is: 15,740.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,837.30 : 28,756.16 = 11,405.87 : x
  2. Step 2: Convert to fraction form
    20,837.30/28,756.16 = 11,405.87/x
  3. Step 3: Cross multiply
    20,837.30x = 28,756.16 × 11,405.87
  4. Step 4: Simplify right side
    20,837.30x = 327,988,821.85
  5. Step 5: Solve for x
    x = 327,988,821.85/20,837.30
  6. Step 6: Final answer
    x = 15,740.47

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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.