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Finding the Fourth Proportional to 54,430.80, 81,630.78 and 21,143.76

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Solution

The fourth proportional to 54,430.80, 81,630.78 and 21,143.76 is: 31,709.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    54,430.80 : 81,630.78 = 21,143.76 : x
  2. Step 2: Convert to fraction form
    54,430.80/81,630.78 = 21,143.76/x
  3. Step 3: Cross multiply
    54,430.80x = 81,630.78 × 21,143.76
  4. Step 4: Simplify right side
    54,430.80x = 1,725,981,620.93
  5. Step 5: Solve for x
    x = 1,725,981,620.93/54,430.80
  6. Step 6: Final answer
    x = 31,709.65

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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.