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Finding the Fourth Proportional to 209,817.60, 314,726.40 and 131,020.80

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Solution

The fourth proportional to 209,817.60, 314,726.40 and 131,020.80 is: 196,531.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    209,817.60 : 314,726.40 = 131,020.80 : x
  2. Step 2: Convert to fraction form
    209,817.60/314,726.40 = 131,020.80/x
  3. Step 3: Cross multiply
    209,817.60x = 314,726.40 × 131,020.80
  4. Step 4: Simplify right side
    209,817.60x = 41,235,704,709.12
  5. Step 5: Solve for x
    x = 41,235,704,709.12/209,817.60
  6. Step 6: Final answer
    x = 196,531.20

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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.