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Finding the Fourth Proportional to 1,258.68, 1,887.54 and 681.24

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Solution

The fourth proportional to 1,258.68, 1,887.54 and 681.24 is: 1,021.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,258.68 : 1,887.54 = 681.24 : x
  2. Step 2: Convert to fraction form
    1,258.68/1,887.54 = 681.24/x
  3. Step 3: Cross multiply
    1,258.68x = 1,887.54 × 681.24
  4. Step 4: Simplify right side
    1,258.68x = 1,285,867.75
  5. Step 5: Solve for x
    x = 1,285,867.75/1,258.68
  6. Step 6: Final answer
    x = 1,021.60

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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.