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Finding the Fourth Proportional to 47,881.40, 71,819.39 and 21,219.71

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Solution

The fourth proportional to 47,881.40, 71,819.39 and 21,219.71 is: 31,828.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    47,881.40 : 71,819.39 = 21,219.71 : x
  2. Step 2: Convert to fraction form
    47,881.40/71,819.39 = 21,219.71/x
  3. Step 3: Cross multiply
    47,881.40x = 71,819.39 × 21,219.71
  4. Step 4: Simplify right side
    47,881.40x = 1,523,986,322.13
  5. Step 5: Solve for x
    x = 1,523,986,322.13/47,881.40
  6. Step 6: Final answer
    x = 31,828.36

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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.