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Finding the Fourth Proportional to 20,925, 28,876.22 and 11,493.40

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Solution

The fourth proportional to 20,925, 28,876.22 and 11,493.40 is: 15,860.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,925 : 28,876.22 = 11,493.40 : x
  2. Step 2: Convert to fraction form
    20,925/28,876.22 = 11,493.40/x
  3. Step 3: Cross multiply
    20,925x = 28,876.22 × 11,493.40
  4. Step 4: Simplify right side
    20,925x = 331,885,946.95
  5. Step 5: Solve for x
    x = 331,885,946.95/20,925
  6. Step 6: Final answer
    x = 15,860.74

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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.