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Finding the Fourth Proportional to 1,258.76, 1,887.56 and 673.66

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Solution

The fourth proportional to 1,258.76, 1,887.56 and 673.66 is: 1,010.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,258.76 : 1,887.56 = 673.66 : x
  2. Step 2: Convert to fraction form
    1,258.76/1,887.56 = 673.66/x
  3. Step 3: Cross multiply
    1,258.76x = 1,887.56 × 673.66
  4. Step 4: Simplify right side
    1,258.76x = 1,271,573.67
  5. Step 5: Solve for x
    x = 1,271,573.67/1,258.76
  6. Step 6: Final answer
    x = 1,010.18

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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.