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Finding the Fourth Proportional to 20,885.79, 28,820.79 and 11,454.33

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Solution

The fourth proportional to 20,885.79, 28,820.79 and 11,454.33 is: 15,806.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,885.79 : 28,820.79 = 11,454.33 : x
  2. Step 2: Convert to fraction form
    20,885.79/28,820.79 = 11,454.33/x
  3. Step 3: Cross multiply
    20,885.79x = 28,820.79 × 11,454.33
  4. Step 4: Simplify right side
    20,885.79x = 330,122,839.52
  5. Step 5: Solve for x
    x = 330,122,839.52/20,885.79
  6. Step 6: Final answer
    x = 15,806.10

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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.