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Finding the Fourth Proportional to 1,320.96, 1,980 and 671.04

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Solution

The fourth proportional to 1,320.96, 1,980 and 671.04 is: 1,005.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,320.96 : 1,980 = 671.04 : x
  2. Step 2: Convert to fraction form
    1,320.96/1,980 = 671.04/x
  3. Step 3: Cross multiply
    1,320.96x = 1,980 × 671.04
  4. Step 4: Simplify right side
    1,320.96x = 1,328,659.20
  5. Step 5: Solve for x
    x = 1,328,659.20/1,320.96
  6. Step 6: Final answer
    x = 1,005.83

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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.