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Finding the Fourth Proportional to 21,803.92, 30,089.12 and 12,851.80

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Solution

The fourth proportional to 21,803.92, 30,089.12 and 12,851.80 is: 17,735.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,803.92 : 30,089.12 = 12,851.80 : x
  2. Step 2: Convert to fraction form
    21,803.92/30,089.12 = 12,851.80/x
  3. Step 3: Cross multiply
    21,803.92x = 30,089.12 × 12,851.80
  4. Step 4: Simplify right side
    21,803.92x = 386,699,352.42
  5. Step 5: Solve for x
    x = 386,699,352.42/21,803.92
  6. Step 6: Final answer
    x = 17,735.31

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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.