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Finding the Fourth Proportional to 20,957.75, 28,921.11 and 11,526.32

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Solution

The fourth proportional to 20,957.75, 28,921.11 and 11,526.32 is: 15,906.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,957.75 : 28,921.11 = 11,526.32 : x
  2. Step 2: Convert to fraction form
    20,957.75/28,921.11 = 11,526.32/x
  3. Step 3: Cross multiply
    20,957.75x = 28,921.11 × 11,526.32
  4. Step 4: Simplify right side
    20,957.75x = 333,353,824.01
  5. Step 5: Solve for x
    x = 333,353,824.01/20,957.75
  6. Step 6: Final answer
    x = 15,906.00

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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.