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Finding the Fourth Proportional to 1,319.08, 1,979.31 and 956.86

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Solution

The fourth proportional to 1,319.08, 1,979.31 and 956.86 is: 1,435.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,319.08 : 1,979.31 = 956.86 : x
  2. Step 2: Convert to fraction form
    1,319.08/1,979.31 = 956.86/x
  3. Step 3: Cross multiply
    1,319.08x = 1,979.31 × 956.86
  4. Step 4: Simplify right side
    1,319.08x = 1,893,910.36
  5. Step 5: Solve for x
    x = 1,893,910.36/1,319.08
  6. Step 6: Final answer
    x = 1,435.78

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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.