Home / 20,789.28-28,689.12-11,358

Finding the Fourth Proportional to 20,789.28, 28,689.12 and 11,358

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Solution

The fourth proportional to 20,789.28, 28,689.12 and 11,358 is: 15,673.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,789.28 : 28,689.12 = 11,358 : x
  2. Step 2: Convert to fraction form
    20,789.28/28,689.12 = 11,358/x
  3. Step 3: Cross multiply
    20,789.28x = 28,689.12 × 11,358
  4. Step 4: Simplify right side
    20,789.28x = 325,851,024.96
  5. Step 5: Solve for x
    x = 325,851,024.96/20,789.28
  6. Step 6: Final answer
    x = 15,673.99

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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.