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Finding the Fourth Proportional to 18,913.91, 28,372.68 and 6,429.78

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Solution

The fourth proportional to 18,913.91, 28,372.68 and 6,429.78 is: 9,645.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,913.91 : 28,372.68 = 6,429.78 : x
  2. Step 2: Convert to fraction form
    18,913.91/28,372.68 = 6,429.78/x
  3. Step 3: Cross multiply
    18,913.91x = 28,372.68 × 6,429.78
  4. Step 4: Simplify right side
    18,913.91x = 182,430,090.41
  5. Step 5: Solve for x
    x = 182,430,090.41/18,913.91
  6. Step 6: Final answer
    x = 9,645.29

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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.