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Finding the Fourth Proportional to 485,655.80, 728,138.10 and 186,020.60

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Solution

The fourth proportional to 485,655.80, 728,138.10 and 186,020.60 is: 278,898.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    485,655.80 : 728,138.10 = 186,020.60 : x
  2. Step 2: Convert to fraction form
    485,655.80/728,138.10 = 186,020.60/x
  3. Step 3: Cross multiply
    485,655.80x = 728,138.10 × 186,020.60
  4. Step 4: Simplify right side
    485,655.80x = 135,448,686,244.86
  5. Step 5: Solve for x
    x = 135,448,686,244.86/485,655.80
  6. Step 6: Final answer
    x = 278,898.52

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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.