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Finding the Fourth Proportional to 1,320.39, 1,979.31 and 734.86

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Solution

The fourth proportional to 1,320.39, 1,979.31 and 734.86 is: 1,101.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,320.39 : 1,979.31 = 734.86 : x
  2. Step 2: Convert to fraction form
    1,320.39/1,979.31 = 734.86/x
  3. Step 3: Cross multiply
    1,320.39x = 1,979.31 × 734.86
  4. Step 4: Simplify right side
    1,320.39x = 1,454,503.64
  5. Step 5: Solve for x
    x = 1,454,503.64/1,320.39
  6. Step 6: Final answer
    x = 1,101.57

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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.