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Finding the Fourth Proportional to 19,781.70, 29,672.55 and 12,408.90

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Solution

The fourth proportional to 19,781.70, 29,672.55 and 12,408.90 is: 18,613.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,781.70 : 29,672.55 = 12,408.90 : x
  2. Step 2: Convert to fraction form
    19,781.70/29,672.55 = 12,408.90/x
  3. Step 3: Cross multiply
    19,781.70x = 29,672.55 × 12,408.90
  4. Step 4: Simplify right side
    19,781.70x = 368,203,705.70
  5. Step 5: Solve for x
    x = 368,203,705.70/19,781.70
  6. Step 6: Final answer
    x = 18,613.35

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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.