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Finding the Fourth Proportional to 1,326.40, 1,989.44 and 352.57

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Solution

The fourth proportional to 1,326.40, 1,989.44 and 352.57 is: 528.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,326.40 : 1,989.44 = 352.57 : x
  2. Step 2: Convert to fraction form
    1,326.40/1,989.44 = 352.57/x
  3. Step 3: Cross multiply
    1,326.40x = 1,989.44 × 352.57
  4. Step 4: Simplify right side
    1,326.40x = 701,416.86
  5. Step 5: Solve for x
    x = 701,416.86/1,326.40
  6. Step 6: Final answer
    x = 528.81

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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.