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Finding the Fourth Proportional to 906.36, 1,361.16 and 691.44

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Solution

The fourth proportional to 906.36, 1,361.16 and 691.44 is: 1,038.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    906.36 : 1,361.16 = 691.44 : x
  2. Step 2: Convert to fraction form
    906.36/1,361.16 = 691.44/x
  3. Step 3: Cross multiply
    906.36x = 1,361.16 × 691.44
  4. Step 4: Simplify right side
    906.36x = 941,160.47
  5. Step 5: Solve for x
    x = 941,160.47/906.36
  6. Step 6: Final answer
    x = 1,038.40

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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.