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Finding the Fourth Proportional to 323,972.40, 485,785.80 and 136,772.40

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Solution

The fourth proportional to 323,972.40, 485,785.80 and 136,772.40 is: 205,085.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    323,972.40 : 485,785.80 = 136,772.40 : x
  2. Step 2: Convert to fraction form
    323,972.40/485,785.80 = 136,772.40/x
  3. Step 3: Cross multiply
    323,972.40x = 485,785.80 × 136,772.40
  4. Step 4: Simplify right side
    323,972.40x = 66,442,089,751.92
  5. Step 5: Solve for x
    x = 66,442,089,751.92/323,972.40
  6. Step 6: Final answer
    x = 205,085.65

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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.