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Finding the Fourth Proportional to 1,258.41, 1,887.70 and 380.87

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Solution

The fourth proportional to 1,258.41, 1,887.70 and 380.87 is: 571.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,258.41 : 1,887.70 = 380.87 : x
  2. Step 2: Convert to fraction form
    1,258.41/1,887.70 = 380.87/x
  3. Step 3: Cross multiply
    1,258.41x = 1,887.70 × 380.87
  4. Step 4: Simplify right side
    1,258.41x = 718,968.30
  5. Step 5: Solve for x
    x = 718,968.30/1,258.41
  6. Step 6: Final answer
    x = 571.33

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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.