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Finding the Fourth Proportional to 217,885.60, 326,828.40 and 138,764.80

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Solution

The fourth proportional to 217,885.60, 326,828.40 and 138,764.80 is: 208,147.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    217,885.60 : 326,828.40 = 138,764.80 : x
  2. Step 2: Convert to fraction form
    217,885.60/326,828.40 = 138,764.80/x
  3. Step 3: Cross multiply
    217,885.60x = 326,828.40 × 138,764.80
  4. Step 4: Simplify right side
    217,885.60x = 45,352,277,560.32
  5. Step 5: Solve for x
    x = 45,352,277,560.32/217,885.60
  6. Step 6: Final answer
    x = 208,147.20

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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.