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Finding the Fourth Proportional to 893.16, 1,338.93 and 405.54

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Solution

The fourth proportional to 893.16, 1,338.93 and 405.54 is: 607.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    893.16 : 1,338.93 = 405.54 : x
  2. Step 2: Convert to fraction form
    893.16/1,338.93 = 405.54/x
  3. Step 3: Cross multiply
    893.16x = 1,338.93 × 405.54
  4. Step 4: Simplify right side
    893.16x = 542,989.67
  5. Step 5: Solve for x
    x = 542,989.67/893.16
  6. Step 6: Final answer
    x = 607.94

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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.