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Finding the Fourth Proportional to 54,386.81, 81,639.81 and 43,213.97

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Solution

The fourth proportional to 54,386.81, 81,639.81 and 43,213.97 is: 64,868.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    54,386.81 : 81,639.81 = 43,213.97 : x
  2. Step 2: Convert to fraction form
    54,386.81/81,639.81 = 43,213.97/x
  3. Step 3: Cross multiply
    54,386.81x = 81,639.81 × 43,213.97
  4. Step 4: Simplify right side
    54,386.81x = 3,527,979,675.88
  5. Step 5: Solve for x
    x = 3,527,979,675.88/54,386.81
  6. Step 6: Final answer
    x = 64,868.30

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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.