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Finding the Fourth Proportional to 215,723.40, 323,730.90 and 120,953.40

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Solution

The fourth proportional to 215,723.40, 323,730.90 and 120,953.40 is: 181,511.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    215,723.40 : 323,730.90 = 120,953.40 : x
  2. Step 2: Convert to fraction form
    215,723.40/323,730.90 = 120,953.40/x
  3. Step 3: Cross multiply
    215,723.40x = 323,730.90 × 120,953.40
  4. Step 4: Simplify right side
    215,723.40x = 39,156,353,040.06
  5. Step 5: Solve for x
    x = 39,156,353,040.06/215,723.40
  6. Step 6: Final answer
    x = 181,511.85

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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.