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Finding the Fourth Proportional to 19,605.80, 29,408.70 and 11,311.40

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Solution

The fourth proportional to 19,605.80, 29,408.70 and 11,311.40 is: 16,967.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,605.80 : 29,408.70 = 11,311.40 : x
  2. Step 2: Convert to fraction form
    19,605.80/29,408.70 = 11,311.40/x
  3. Step 3: Cross multiply
    19,605.80x = 29,408.70 × 11,311.40
  4. Step 4: Simplify right side
    19,605.80x = 332,653,569.18
  5. Step 5: Solve for x
    x = 332,653,569.18/19,605.80
  6. Step 6: Final answer
    x = 16,967.10

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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.