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Finding the Fourth Proportional to 20,555.40, 30,833.10 and 11,807.40

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Solution

The fourth proportional to 20,555.40, 30,833.10 and 11,807.40 is: 17,711.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,555.40 : 30,833.10 = 11,807.40 : x
  2. Step 2: Convert to fraction form
    20,555.40/30,833.10 = 11,807.40/x
  3. Step 3: Cross multiply
    20,555.40x = 30,833.10 × 11,807.40
  4. Step 4: Simplify right side
    20,555.40x = 364,058,744.94
  5. Step 5: Solve for x
    x = 364,058,744.94/20,555.40
  6. Step 6: Final answer
    x = 17,711.10

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.