Home / 20,855.89-28,781.52-11,423.86

Finding the Fourth Proportional to 20,855.89, 28,781.52 and 11,423.86

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Solution

The fourth proportional to 20,855.89, 28,781.52 and 11,423.86 is: 15,765.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,855.89 : 28,781.52 = 11,423.86 : x
  2. Step 2: Convert to fraction form
    20,855.89/28,781.52 = 11,423.86/x
  3. Step 3: Cross multiply
    20,855.89x = 28,781.52 × 11,423.86
  4. Step 4: Simplify right side
    20,855.89x = 328,796,055.07
  5. Step 5: Solve for x
    x = 328,796,055.07/20,855.89
  6. Step 6: Final answer
    x = 15,765.14

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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.