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Finding the Fourth Proportional to 56,053.80, 84,077.64 and 20,990.88

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Solution

The fourth proportional to 56,053.80, 84,077.64 and 20,990.88 is: 31,485.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    56,053.80 : 84,077.64 = 20,990.88 : x
  2. Step 2: Convert to fraction form
    56,053.80/84,077.64 = 20,990.88/x
  3. Step 3: Cross multiply
    56,053.80x = 84,077.64 × 20,990.88
  4. Step 4: Simplify right side
    56,053.80x = 1,764,863,651.92
  5. Step 5: Solve for x
    x = 1,764,863,651.92/56,053.80
  6. Step 6: Final answer
    x = 31,485.17

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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.