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Finding the Fourth Proportional to 205,720.40, 308,580.60 and 65,493.20

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Solution

The fourth proportional to 205,720.40, 308,580.60 and 65,493.20 is: 98,239.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    205,720.40 : 308,580.60 = 65,493.20 : x
  2. Step 2: Convert to fraction form
    205,720.40/308,580.60 = 65,493.20/x
  3. Step 3: Cross multiply
    205,720.40x = 308,580.60 × 65,493.20
  4. Step 4: Simplify right side
    205,720.40x = 20,209,930,951.92
  5. Step 5: Solve for x
    x = 20,209,930,951.92/205,720.40
  6. Step 6: Final answer
    x = 98,239.80

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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.