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Finding the Fourth Proportional to 2,117.70, 3,175.40 and 636.71

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Solution

The fourth proportional to 2,117.70, 3,175.40 and 636.71 is: 954.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,117.70 : 3,175.40 = 636.71 : x
  2. Step 2: Convert to fraction form
    2,117.70/3,175.40 = 636.71/x
  3. Step 3: Cross multiply
    2,117.70x = 3,175.40 × 636.71
  4. Step 4: Simplify right side
    2,117.70x = 2,021,789.87
  5. Step 5: Solve for x
    x = 2,021,789.87/2,117.70
  6. Step 6: Final answer
    x = 954.71

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1.5x scale

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.