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Finding the Fourth Proportional to 54,001.71, 81,014.09 and 20,721.50

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Solution

The fourth proportional to 54,001.71, 81,014.09 and 20,721.50 is: 31,086.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    54,001.71 : 81,014.09 = 20,721.50 : x
  2. Step 2: Convert to fraction form
    54,001.71/81,014.09 = 20,721.50/x
  3. Step 3: Cross multiply
    54,001.71x = 81,014.09 × 20,721.50
  4. Step 4: Simplify right side
    54,001.71x = 1,678,733,465.94
  5. Step 5: Solve for x
    x = 1,678,733,465.94/54,001.71
  6. Step 6: Final answer
    x = 31,086.67

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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.