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Finding the Fourth Proportional to 1,320.58, 1,980.58 and 850.64

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Solution

The fourth proportional to 1,320.58, 1,980.58 and 850.64 is: 1,275.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,320.58 : 1,980.58 = 850.64 : x
  2. Step 2: Convert to fraction form
    1,320.58/1,980.58 = 850.64/x
  3. Step 3: Cross multiply
    1,320.58x = 1,980.58 × 850.64
  4. Step 4: Simplify right side
    1,320.58x = 1,684,760.57
  5. Step 5: Solve for x
    x = 1,684,760.57/1,320.58
  6. Step 6: Final answer
    x = 1,275.78

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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.