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Finding the Fourth Proportional to 1,320.53, 1,978.96 and 1,281.11

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Solution

The fourth proportional to 1,320.53, 1,978.96 and 1,281.11 is: 1,919.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,320.53 : 1,978.96 = 1,281.11 : x
  2. Step 2: Convert to fraction form
    1,320.53/1,978.96 = 1,281.11/x
  3. Step 3: Cross multiply
    1,320.53x = 1,978.96 × 1,281.11
  4. Step 4: Simplify right side
    1,320.53x = 2,535,265.45
  5. Step 5: Solve for x
    x = 2,535,265.45/1,320.53
  6. Step 6: Final answer
    x = 1,919.88

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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.