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Finding the Fourth Proportional to 1,258.20, 1,886.76 and 641.25

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Solution

The fourth proportional to 1,258.20, 1,886.76 and 641.25 is: 961.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,258.20 : 1,886.76 = 641.25 : x
  2. Step 2: Convert to fraction form
    1,258.20/1,886.76 = 641.25/x
  3. Step 3: Cross multiply
    1,258.20x = 1,886.76 × 641.25
  4. Step 4: Simplify right side
    1,258.20x = 1,209,884.85
  5. Step 5: Solve for x
    x = 1,209,884.85/1,258.20
  6. Step 6: Final answer
    x = 961.60

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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.