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Finding the Fourth Proportional to 1,320.34, 1,980.82 and 395.88

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Solution

The fourth proportional to 1,320.34, 1,980.82 and 395.88 is: 593.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,320.34 : 1,980.82 = 395.88 : x
  2. Step 2: Convert to fraction form
    1,320.34/1,980.82 = 395.88/x
  3. Step 3: Cross multiply
    1,320.34x = 1,980.82 × 395.88
  4. Step 4: Simplify right side
    1,320.34x = 784,167.02
  5. Step 5: Solve for x
    x = 784,167.02/1,320.34
  6. Step 6: Final answer
    x = 593.91

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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.