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Finding the Fourth Proportional to 19,790.40, 29,674.80 and 8,090.40

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Solution

The fourth proportional to 19,790.40, 29,674.80 and 8,090.40 is: 12,131.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,790.40 : 29,674.80 = 8,090.40 : x
  2. Step 2: Convert to fraction form
    19,790.40/29,674.80 = 8,090.40/x
  3. Step 3: Cross multiply
    19,790.40x = 29,674.80 × 8,090.40
  4. Step 4: Simplify right side
    19,790.40x = 240,081,001.92
  5. Step 5: Solve for x
    x = 240,081,001.92/19,790.40
  6. Step 6: Final answer
    x = 12,131.18

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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.