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Finding the Fourth Proportional to 54,292.70, 81,451.20 and 21,009.80

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Solution

The fourth proportional to 54,292.70, 81,451.20 and 21,009.80 is: 31,519.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    54,292.70 : 81,451.20 = 21,009.80 : x
  2. Step 2: Convert to fraction form
    54,292.70/81,451.20 = 21,009.80/x
  3. Step 3: Cross multiply
    54,292.70x = 81,451.20 × 21,009.80
  4. Step 4: Simplify right side
    54,292.70x = 1,711,273,421.76
  5. Step 5: Solve for x
    x = 1,711,273,421.76/54,292.70
  6. Step 6: Final answer
    x = 31,519.40

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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.