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Finding the Fourth Proportional to 209,969.20, 314,953.80 and 76,805.20

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Solution

The fourth proportional to 209,969.20, 314,953.80 and 76,805.20 is: 115,207.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    209,969.20 : 314,953.80 = 76,805.20 : x
  2. Step 2: Convert to fraction form
    209,969.20/314,953.80 = 76,805.20/x
  3. Step 3: Cross multiply
    209,969.20x = 314,953.80 × 76,805.20
  4. Step 4: Simplify right side
    209,969.20x = 24,190,089,599.76
  5. Step 5: Solve for x
    x = 24,190,089,599.76/209,969.20
  6. Step 6: Final answer
    x = 115,207.80

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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.