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Finding the Fourth Proportional to 19,780.40, 29,659.80 and 8,080.40

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Solution

The fourth proportional to 19,780.40, 29,659.80 and 8,080.40 is: 12,116.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,780.40 : 29,659.80 = 8,080.40 : x
  2. Step 2: Convert to fraction form
    19,780.40/29,659.80 = 8,080.40/x
  3. Step 3: Cross multiply
    19,780.40x = 29,659.80 × 8,080.40
  4. Step 4: Simplify right side
    19,780.40x = 239,663,047.92
  5. Step 5: Solve for x
    x = 239,663,047.92/19,780.40
  6. Step 6: Final answer
    x = 12,116.19

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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.