Home / 20,788.64-28,689.35-12,719.76

Finding the Fourth Proportional to 20,788.64, 28,689.35 and 12,719.76

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Solution

The fourth proportional to 20,788.64, 28,689.35 and 12,719.76 is: 17,553.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,788.64 : 28,689.35 = 12,719.76 : x
  2. Step 2: Convert to fraction form
    20,788.64/28,689.35 = 12,719.76/x
  3. Step 3: Cross multiply
    20,788.64x = 28,689.35 × 12,719.76
  4. Step 4: Simplify right side
    20,788.64x = 364,921,678.36
  5. Step 5: Solve for x
    x = 364,921,678.36/20,788.64
  6. Step 6: Final answer
    x = 17,553.90

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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.