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Finding the Fourth Proportional to 1,326.05, 1,989.10 and 352.15

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Solution

The fourth proportional to 1,326.05, 1,989.10 and 352.15 is: 528.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,326.05 : 1,989.10 = 352.15 : x
  2. Step 2: Convert to fraction form
    1,326.05/1,989.10 = 352.15/x
  3. Step 3: Cross multiply
    1,326.05x = 1,989.10 × 352.15
  4. Step 4: Simplify right side
    1,326.05x = 700,451.62
  5. Step 5: Solve for x
    x = 700,451.62/1,326.05
  6. Step 6: Final answer
    x = 528.23

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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.