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Finding the Fourth Proportional to 1,320.38, 1,980.88 and 703.76

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Solution

The fourth proportional to 1,320.38, 1,980.88 and 703.76 is: 1,055.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,320.38 : 1,980.88 = 703.76 : x
  2. Step 2: Convert to fraction form
    1,320.38/1,980.88 = 703.76/x
  3. Step 3: Cross multiply
    1,320.38x = 1,980.88 × 703.76
  4. Step 4: Simplify right side
    1,320.38x = 1,394,067.30
  5. Step 5: Solve for x
    x = 1,394,067.30/1,320.38
  6. Step 6: Final answer
    x = 1,055.81

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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.