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Finding the Fourth Proportional to 893.52, 1,339.20 and 405.90

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Solution

The fourth proportional to 893.52, 1,339.20 and 405.90 is: 608.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    893.52 : 1,339.20 = 405.90 : x
  2. Step 2: Convert to fraction form
    893.52/1,339.20 = 405.90/x
  3. Step 3: Cross multiply
    893.52x = 1,339.20 × 405.90
  4. Step 4: Simplify right side
    893.52x = 543,581.28
  5. Step 5: Solve for x
    x = 543,581.28/893.52
  6. Step 6: Final answer
    x = 608.36

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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.