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Finding the Fourth Proportional to 43,217.88, 64,828.88 and 21,004.80

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Solution

The fourth proportional to 43,217.88, 64,828.88 and 21,004.80 is: 31,508.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    43,217.88 : 64,828.88 = 21,004.80 : x
  2. Step 2: Convert to fraction form
    43,217.88/64,828.88 = 21,004.80/x
  3. Step 3: Cross multiply
    43,217.88x = 64,828.88 × 21,004.80
  4. Step 4: Simplify right side
    43,217.88x = 1,361,717,711.14
  5. Step 5: Solve for x
    x = 1,361,717,711.14/43,217.88
  6. Step 6: Final answer
    x = 31,508.20

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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.