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Finding the Fourth Proportional to 691.75, 1,037.83 and 258.94

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Solution

The fourth proportional to 691.75, 1,037.83 and 258.94 is: 388.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.75 : 1,037.83 = 258.94 : x
  2. Step 2: Convert to fraction form
    691.75/1,037.83 = 258.94/x
  3. Step 3: Cross multiply
    691.75x = 1,037.83 × 258.94
  4. Step 4: Simplify right side
    691.75x = 268,732.46
  5. Step 5: Solve for x
    x = 268,732.46/691.75
  6. Step 6: Final answer
    x = 388.48

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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.