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Finding the Fourth Proportional to 217,912.60, 326,868.90 and 77,620.60

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Solution

The fourth proportional to 217,912.60, 326,868.90 and 77,620.60 is: 116,430.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    217,912.60 : 326,868.90 = 77,620.60 : x
  2. Step 2: Convert to fraction form
    217,912.60/326,868.90 = 77,620.60/x
  3. Step 3: Cross multiply
    217,912.60x = 326,868.90 × 77,620.60
  4. Step 4: Simplify right side
    217,912.60x = 25,371,760,139.34
  5. Step 5: Solve for x
    x = 25,371,760,139.34/217,912.60
  6. Step 6: Final answer
    x = 116,430.90

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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.