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Finding the Fourth Proportional to 19,381.20, 28,999.80 and 14,197.20

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Solution

The fourth proportional to 19,381.20, 28,999.80 and 14,197.20 is: 21,243.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,381.20 : 28,999.80 = 14,197.20 : x
  2. Step 2: Convert to fraction form
    19,381.20/28,999.80 = 14,197.20/x
  3. Step 3: Cross multiply
    19,381.20x = 28,999.80 × 14,197.20
  4. Step 4: Simplify right side
    19,381.20x = 411,715,960.56
  5. Step 5: Solve for x
    x = 411,715,960.56/19,381.20
  6. Step 6: Final answer
    x = 21,243.06

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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.