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Finding the Fourth Proportional to 20,429.60, 30,644.40 and 18,874.40

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Solution

The fourth proportional to 20,429.60, 30,644.40 and 18,874.40 is: 28,311.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,429.60 : 30,644.40 = 18,874.40 : x
  2. Step 2: Convert to fraction form
    20,429.60/30,644.40 = 18,874.40/x
  3. Step 3: Cross multiply
    20,429.60x = 30,644.40 × 18,874.40
  4. Step 4: Simplify right side
    20,429.60x = 578,394,663.36
  5. Step 5: Solve for x
    x = 578,394,663.36/20,429.60
  6. Step 6: Final answer
    x = 28,311.60

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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.