Home / 20,862.84-28,789.62-11,431.20

Finding the Fourth Proportional to 20,862.84, 28,789.62 and 11,431.20

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Solution

The fourth proportional to 20,862.84, 28,789.62 and 11,431.20 is: 15,774.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,862.84 : 28,789.62 = 11,431.20 : x
  2. Step 2: Convert to fraction form
    20,862.84/28,789.62 = 11,431.20/x
  3. Step 3: Cross multiply
    20,862.84x = 28,789.62 × 11,431.20
  4. Step 4: Simplify right side
    20,862.84x = 329,099,904.14
  5. Step 5: Solve for x
    x = 329,099,904.14/20,862.84
  6. Step 6: Final answer
    x = 15,774.45

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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.