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Finding the Fourth Proportional to 893.28, 1,339.96 and 345.76

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Solution

The fourth proportional to 893.28, 1,339.96 and 345.76 is: 518.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    893.28 : 1,339.96 = 345.76 : x
  2. Step 2: Convert to fraction form
    893.28/1,339.96 = 345.76/x
  3. Step 3: Cross multiply
    893.28x = 1,339.96 × 345.76
  4. Step 4: Simplify right side
    893.28x = 463,304.57
  5. Step 5: Solve for x
    x = 463,304.57/893.28
  6. Step 6: Final answer
    x = 518.66

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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.