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Finding the Fourth Proportional to 691.63, 1,037.41 and 258.75

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Solution

The fourth proportional to 691.63, 1,037.41 and 258.75 is: 388.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.63 : 1,037.41 = 258.75 : x
  2. Step 2: Convert to fraction form
    691.63/1,037.41 = 258.75/x
  3. Step 3: Cross multiply
    691.63x = 1,037.41 × 258.75
  4. Step 4: Simplify right side
    691.63x = 268,429.84
  5. Step 5: Solve for x
    x = 268,429.84/691.63
  6. Step 6: Final answer
    x = 388.11

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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.