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Finding the Fourth Proportional to 485,764.80, 728,301.60 and 186,129.60

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Solution

The fourth proportional to 485,764.80, 728,301.60 and 186,129.60 is: 279,061.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    485,764.80 : 728,301.60 = 186,129.60 : x
  2. Step 2: Convert to fraction form
    485,764.80/728,301.60 = 186,129.60/x
  3. Step 3: Cross multiply
    485,764.80x = 728,301.60 × 186,129.60
  4. Step 4: Simplify right side
    485,764.80x = 135,558,485,487.36
  5. Step 5: Solve for x
    x = 135,558,485,487.36/485,764.80
  6. Step 6: Final answer
    x = 279,061.98

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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.