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Finding the Fourth Proportional to 485,641.28, 728,046.56 and 186,336.68

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Solution

The fourth proportional to 485,641.28, 728,046.56 and 186,336.68 is: 279,345.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    485,641.28 : 728,046.56 = 186,336.68 : x
  2. Step 2: Convert to fraction form
    485,641.28/728,046.56 = 186,336.68/x
  3. Step 3: Cross multiply
    485,641.28x = 728,046.56 × 186,336.68
  4. Step 4: Simplify right side
    485,641.28x = 135,661,774,303.91
  5. Step 5: Solve for x
    x = 135,661,774,303.91/485,641.28
  6. Step 6: Final answer
    x = 279,345.64

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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.