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Finding the Fourth Proportional to 691.90, 1,037.79 and 204.94

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Solution

The fourth proportional to 691.90, 1,037.79 and 204.94 is: 307.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.90 : 1,037.79 = 204.94 : x
  2. Step 2: Convert to fraction form
    691.90/1,037.79 = 204.94/x
  3. Step 3: Cross multiply
    691.90x = 1,037.79 × 204.94
  4. Step 4: Simplify right side
    691.90x = 212,684.68
  5. Step 5: Solve for x
    x = 212,684.68/691.90
  6. Step 6: Final answer
    x = 307.39

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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.