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Finding the Fourth Proportional to 18,938.98, 28,398.47 and 8,404.43

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Solution

The fourth proportional to 18,938.98, 28,398.47 and 8,404.43 is: 12,602.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,938.98 : 28,398.47 = 8,404.43 : x
  2. Step 2: Convert to fraction form
    18,938.98/28,398.47 = 8,404.43/x
  3. Step 3: Cross multiply
    18,938.98x = 28,398.47 × 8,404.43
  4. Step 4: Simplify right side
    18,938.98x = 238,672,769.21
  5. Step 5: Solve for x
    x = 238,672,769.21/18,938.98
  6. Step 6: Final answer
    x = 12,602.20

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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.