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Finding the Fourth Proportional to 215,808.40, 323,712.60 and 211,661.20

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Solution

The fourth proportional to 215,808.40, 323,712.60 and 211,661.20 is: 317,491.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    215,808.40 : 323,712.60 = 211,661.20 : x
  2. Step 2: Convert to fraction form
    215,808.40/323,712.60 = 211,661.20/x
  3. Step 3: Cross multiply
    215,808.40x = 323,712.60 × 211,661.20
  4. Step 4: Simplify right side
    215,808.40x = 68,517,397,371.12
  5. Step 5: Solve for x
    x = 68,517,397,371.12/215,808.40
  6. Step 6: Final answer
    x = 317,491.80

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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.