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Finding the Fourth Proportional to 215,979.60, 323,969.40 and 103,640.70

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Solution

The fourth proportional to 215,979.60, 323,969.40 and 103,640.70 is: 155,461.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    215,979.60 : 323,969.40 = 103,640.70 : x
  2. Step 2: Convert to fraction form
    215,979.60/323,969.40 = 103,640.70/x
  3. Step 3: Cross multiply
    215,979.60x = 323,969.40 × 103,640.70
  4. Step 4: Simplify right side
    215,979.60x = 33,576,415,394.58
  5. Step 5: Solve for x
    x = 33,576,415,394.58/215,979.60
  6. Step 6: Final answer
    x = 155,461.05

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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.