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Finding the Fourth Proportional to 485,428.31, 728,247.56 and 185,908.94

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Solution

The fourth proportional to 485,428.31, 728,247.56 and 185,908.94 is: 278,903.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    485,428.31 : 728,247.56 = 185,908.94 : x
  2. Step 2: Convert to fraction form
    485,428.31/728,247.56 = 185,908.94/x
  3. Step 3: Cross multiply
    485,428.31x = 728,247.56 × 185,908.94
  4. Step 4: Simplify right side
    485,428.31x = 135,387,727,366.40
  5. Step 5: Solve for x
    x = 135,387,727,366.40/485,428.31
  6. Step 6: Final answer
    x = 278,903.65

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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.