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Finding the Fourth Proportional to 20,571, 28,387.76 and 11,618.34

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Solution

The fourth proportional to 20,571, 28,387.76 and 11,618.34 is: 16,033.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,571 : 28,387.76 = 11,618.34 : x
  2. Step 2: Convert to fraction form
    20,571/28,387.76 = 11,618.34/x
  3. Step 3: Cross multiply
    20,571x = 28,387.76 × 11,618.34
  4. Step 4: Simplify right side
    20,571x = 329,818,647.52
  5. Step 5: Solve for x
    x = 329,818,647.52/20,571
  6. Step 6: Final answer
    x = 16,033.18

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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.