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Finding the Fourth Proportional to 54,271.70, 81,419.70 and 20,988.80

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Solution

The fourth proportional to 54,271.70, 81,419.70 and 20,988.80 is: 31,487.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    54,271.70 : 81,419.70 = 20,988.80 : x
  2. Step 2: Convert to fraction form
    54,271.70/81,419.70 = 20,988.80/x
  3. Step 3: Cross multiply
    54,271.70x = 81,419.70 × 20,988.80
  4. Step 4: Simplify right side
    54,271.70x = 1,708,901,799.36
  5. Step 5: Solve for x
    x = 1,708,901,799.36/54,271.70
  6. Step 6: Final answer
    x = 31,487.90

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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.