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Finding the Fourth Proportional to 54,263.70, 81,407.70 and 20,980.80

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Solution

The fourth proportional to 54,263.70, 81,407.70 and 20,980.80 is: 31,475.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    54,263.70 : 81,407.70 = 20,980.80 : x
  2. Step 2: Convert to fraction form
    54,263.70/81,407.70 = 20,980.80/x
  3. Step 3: Cross multiply
    54,263.70x = 81,407.70 × 20,980.80
  4. Step 4: Simplify right side
    54,263.70x = 1,707,998,672.16
  5. Step 5: Solve for x
    x = 1,707,998,672.16/54,263.70
  6. Step 6: Final answer
    x = 31,475.90

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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.