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Finding the Fourth Proportional to 1,297.91, 1,934.60 and 1,258.98

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Solution

The fourth proportional to 1,297.91, 1,934.60 and 1,258.98 is: 1,876.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,297.91 : 1,934.60 = 1,258.98 : x
  2. Step 2: Convert to fraction form
    1,297.91/1,934.60 = 1,258.98/x
  3. Step 3: Cross multiply
    1,297.91x = 1,934.60 × 1,258.98
  4. Step 4: Simplify right side
    1,297.91x = 2,435,616.41
  5. Step 5: Solve for x
    x = 2,435,616.41/1,297.91
  6. Step 6: Final answer
    x = 1,876.58

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.