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Finding the Fourth Proportional to 1,320.36, 1,821.80 and 988.04

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Solution

The fourth proportional to 1,320.36, 1,821.80 and 988.04 is: 1,363.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,320.36 : 1,821.80 = 988.04 : x
  2. Step 2: Convert to fraction form
    1,320.36/1,821.80 = 988.04/x
  3. Step 3: Cross multiply
    1,320.36x = 1,821.80 × 988.04
  4. Step 4: Simplify right side
    1,320.36x = 1,800,011.27
  5. Step 5: Solve for x
    x = 1,800,011.27/1,320.36
  6. Step 6: Final answer
    x = 1,363.27

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.