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Finding the Fourth Proportional to 19,909.20, 29,863.80 and 14,077.20

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Solution

The fourth proportional to 19,909.20, 29,863.80 and 14,077.20 is: 21,115.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,909.20 : 29,863.80 = 14,077.20 : x
  2. Step 2: Convert to fraction form
    19,909.20/29,863.80 = 14,077.20/x
  3. Step 3: Cross multiply
    19,909.20x = 29,863.80 × 14,077.20
  4. Step 4: Simplify right side
    19,909.20x = 420,398,685.36
  5. Step 5: Solve for x
    x = 420,398,685.36/19,909.20
  6. Step 6: Final answer
    x = 21,115.80

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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.