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Finding the Fourth Proportional to 691.57, 953.94 and 411.61

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Solution

The fourth proportional to 691.57, 953.94 and 411.61 is: 567.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.57 : 953.94 = 411.61 : x
  2. Step 2: Convert to fraction form
    691.57/953.94 = 411.61/x
  3. Step 3: Cross multiply
    691.57x = 953.94 × 411.61
  4. Step 4: Simplify right side
    691.57x = 392,653.63
  5. Step 5: Solve for x
    x = 392,653.63/691.57
  6. Step 6: Final answer
    x = 567.78

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.