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Finding the Fourth Proportional to 20,430.40, 30,658.80 and 11,076.88

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Solution

The fourth proportional to 20,430.40, 30,658.80 and 11,076.88 is: 16,622.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,430.40 : 30,658.80 = 11,076.88 : x
  2. Step 2: Convert to fraction form
    20,430.40/30,658.80 = 11,076.88/x
  3. Step 3: Cross multiply
    20,430.40x = 30,658.80 × 11,076.88
  4. Step 4: Simplify right side
    20,430.40x = 339,603,848.54
  5. Step 5: Solve for x
    x = 339,603,848.54/20,430.40
  6. Step 6: Final answer
    x = 16,622.48

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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.