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Finding the Fourth Proportional to 20,554.80, 30,821.40 and 7,405.20

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Solution

The fourth proportional to 20,554.80, 30,821.40 and 7,405.20 is: 11,103.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,554.80 : 30,821.40 = 7,405.20 : x
  2. Step 2: Convert to fraction form
    20,554.80/30,821.40 = 7,405.20/x
  3. Step 3: Cross multiply
    20,554.80x = 30,821.40 × 7,405.20
  4. Step 4: Simplify right side
    20,554.80x = 228,238,631.28
  5. Step 5: Solve for x
    x = 228,238,631.28/20,554.80
  6. Step 6: Final answer
    x = 11,103.91

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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.