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Finding the Fourth Proportional to 21,178.80, 29,239.41 and 13,231.80

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Solution

The fourth proportional to 21,178.80, 29,239.41 and 13,231.80 is: 18,267.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,178.80 : 29,239.41 = 13,231.80 : x
  2. Step 2: Convert to fraction form
    21,178.80/29,239.41 = 13,231.80/x
  3. Step 3: Cross multiply
    21,178.80x = 29,239.41 × 13,231.80
  4. Step 4: Simplify right side
    21,178.80x = 386,890,025.24
  5. Step 5: Solve for x
    x = 386,890,025.24/21,178.80
  6. Step 6: Final answer
    x = 18,267.80

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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.