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Finding the Fourth Proportional to 1,305.15, 1,956.48 and 438.86

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Solution

The fourth proportional to 1,305.15, 1,956.48 and 438.86 is: 657.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,305.15 : 1,956.48 = 438.86 : x
  2. Step 2: Convert to fraction form
    1,305.15/1,956.48 = 438.86/x
  3. Step 3: Cross multiply
    1,305.15x = 1,956.48 × 438.86
  4. Step 4: Simplify right side
    1,305.15x = 858,611.03
  5. Step 5: Solve for x
    x = 858,611.03/1,305.15
  6. Step 6: Final answer
    x = 657.86

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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.