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Finding the Fourth Proportional to 14,000.20, 21,000.30 and 13,319.80

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Solution

The fourth proportional to 14,000.20, 21,000.30 and 13,319.80 is: 19,979.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,000.20 : 21,000.30 = 13,319.80 : x
  2. Step 2: Convert to fraction form
    14,000.20/21,000.30 = 13,319.80/x
  3. Step 3: Cross multiply
    14,000.20x = 21,000.30 × 13,319.80
  4. Step 4: Simplify right side
    14,000.20x = 279,719,795.94
  5. Step 5: Solve for x
    x = 279,719,795.94/14,000.20
  6. Step 6: Final answer
    x = 19,979.70

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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.