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Finding the Fourth Proportional to 893.36, 1,340.56 and 380.40

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Solution

The fourth proportional to 893.36, 1,340.56 and 380.40 is: 570.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    893.36 : 1,340.56 = 380.40 : x
  2. Step 2: Convert to fraction form
    893.36/1,340.56 = 380.40/x
  3. Step 3: Cross multiply
    893.36x = 1,340.56 × 380.40
  4. Step 4: Simplify right side
    893.36x = 509,949.02
  5. Step 5: Solve for x
    x = 509,949.02/893.36
  6. Step 6: Final answer
    x = 570.82

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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.