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Finding the Fourth Proportional to 1,328.58, 1,992.90 and 354.72

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Solution

The fourth proportional to 1,328.58, 1,992.90 and 354.72 is: 532.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,328.58 : 1,992.90 = 354.72 : x
  2. Step 2: Convert to fraction form
    1,328.58/1,992.90 = 354.72/x
  3. Step 3: Cross multiply
    1,328.58x = 1,992.90 × 354.72
  4. Step 4: Simplify right side
    1,328.58x = 706,921.49
  5. Step 5: Solve for x
    x = 706,921.49/1,328.58
  6. Step 6: Final answer
    x = 532.09

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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.