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Finding the Fourth Proportional to 1,320.27, 1,978.35 and 669.84

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Solution

The fourth proportional to 1,320.27, 1,978.35 and 669.84 is: 1,003.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,320.27 : 1,978.35 = 669.84 : x
  2. Step 2: Convert to fraction form
    1,320.27/1,978.35 = 669.84/x
  3. Step 3: Cross multiply
    1,320.27x = 1,978.35 × 669.84
  4. Step 4: Simplify right side
    1,320.27x = 1,325,177.96
  5. Step 5: Solve for x
    x = 1,325,177.96/1,320.27
  6. Step 6: Final answer
    x = 1,003.72

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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.