Home / 20,575.28-28,393.89-11,143.84

Finding the Fourth Proportional to 20,575.28, 28,393.89 and 11,143.84

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Solution

The fourth proportional to 20,575.28, 28,393.89 and 11,143.84 is: 15,378.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,575.28 : 28,393.89 = 11,143.84 : x
  2. Step 2: Convert to fraction form
    20,575.28/28,393.89 = 11,143.84/x
  3. Step 3: Cross multiply
    20,575.28x = 28,393.89 × 11,143.84
  4. Step 4: Simplify right side
    20,575.28x = 316,416,967.14
  5. Step 5: Solve for x
    x = 316,416,967.14/20,575.28
  6. Step 6: Final answer
    x = 15,378.50

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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.