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Finding the Fourth Proportional to 893.76, 1,340.84 and 406.88

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Solution

The fourth proportional to 893.76, 1,340.84 and 406.88 is: 610.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    893.76 : 1,340.84 = 406.88 : x
  2. Step 2: Convert to fraction form
    893.76/1,340.84 = 406.88/x
  3. Step 3: Cross multiply
    893.76x = 1,340.84 × 406.88
  4. Step 4: Simplify right side
    893.76x = 545,560.98
  5. Step 5: Solve for x
    x = 545,560.98/893.76
  6. Step 6: Final answer
    x = 610.41

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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.