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Finding the Fourth Proportional to 906.76, 1,360.62 and 691.64

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Solution

The fourth proportional to 906.76, 1,360.62 and 691.64 is: 1,037.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    906.76 : 1,360.62 = 691.64 : x
  2. Step 2: Convert to fraction form
    906.76/1,360.62 = 691.64/x
  3. Step 3: Cross multiply
    906.76x = 1,360.62 × 691.64
  4. Step 4: Simplify right side
    906.76x = 941,059.22
  5. Step 5: Solve for x
    x = 941,059.22/906.76
  6. Step 6: Final answer
    x = 1,037.83

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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.