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Finding the Fourth Proportional to 205,890.40, 308,806.80 and 65,663.20

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Solution

The fourth proportional to 205,890.40, 308,806.80 and 65,663.20 is: 98,485.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    205,890.40 : 308,806.80 = 65,663.20 : x
  2. Step 2: Convert to fraction form
    205,890.40/308,806.80 = 65,663.20/x
  3. Step 3: Cross multiply
    205,890.40x = 308,806.80 × 65,663.20
  4. Step 4: Simplify right side
    205,890.40x = 20,277,242,669.76
  5. Step 5: Solve for x
    x = 20,277,242,669.76/205,890.40
  6. Step 6: Final answer
    x = 98,485.62

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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.