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Finding the Fourth Proportional to 205,705.30, 308,580.64 and 65,431.12

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Solution

The fourth proportional to 205,705.30, 308,580.64 and 65,431.12 is: 98,153.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    205,705.30 : 308,580.64 = 65,431.12 : x
  2. Step 2: Convert to fraction form
    205,705.30/308,580.64 = 65,431.12/x
  3. Step 3: Cross multiply
    205,705.30x = 308,580.64 × 65,431.12
  4. Step 4: Simplify right side
    205,705.30x = 20,190,776,885.52
  5. Step 5: Solve for x
    x = 20,190,776,885.52/205,705.30
  6. Step 6: Final answer
    x = 98,153.90

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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.