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Finding the Fourth Proportional to 485,935.71, 728,920.65 and 130,958.21

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Solution

The fourth proportional to 485,935.71, 728,920.65 and 130,958.21 is: 196,441.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    485,935.71 : 728,920.65 = 130,958.21 : x
  2. Step 2: Convert to fraction form
    485,935.71/728,920.65 = 130,958.21/x
  3. Step 3: Cross multiply
    485,935.71x = 728,920.65 × 130,958.21
  4. Step 4: Simplify right side
    485,935.71x = 95,458,139,911.43
  5. Step 5: Solve for x
    x = 95,458,139,911.43/485,935.71
  6. Step 6: Final answer
    x = 196,441.91

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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.