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Finding the Fourth Proportional to 20,957.76, 28,921.95 and 11,526.48

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Solution

The fourth proportional to 20,957.76, 28,921.95 and 11,526.48 is: 15,906.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,957.76 : 28,921.95 = 11,526.48 : x
  2. Step 2: Convert to fraction form
    20,957.76/28,921.95 = 11,526.48/x
  3. Step 3: Cross multiply
    20,957.76x = 28,921.95 × 11,526.48
  4. Step 4: Simplify right side
    20,957.76x = 333,368,278.24
  5. Step 5: Solve for x
    x = 333,368,278.24/20,957.76
  6. Step 6: Final answer
    x = 15,906.68

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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.