Home / 20,985.92-28,960.64-11,425.89

Finding the Fourth Proportional to 20,985.92, 28,960.64 and 11,425.89

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Solution

The fourth proportional to 20,985.92, 28,960.64 and 11,425.89 is: 15,767.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,985.92 : 28,960.64 = 11,425.89 : x
  2. Step 2: Convert to fraction form
    20,985.92/28,960.64 = 11,425.89/x
  3. Step 3: Cross multiply
    20,985.92x = 28,960.64 × 11,425.89
  4. Step 4: Simplify right side
    20,985.92x = 330,901,120.20
  5. Step 5: Solve for x
    x = 330,901,120.20/20,985.92
  6. Step 6: Final answer
    x = 15,767.77

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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.