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Finding the Fourth Proportional to 1,258.37, 1,887.83 and 380.86

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Solution

The fourth proportional to 1,258.37, 1,887.83 and 380.86 is: 571.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,258.37 : 1,887.83 = 380.86 : x
  2. Step 2: Convert to fraction form
    1,258.37/1,887.83 = 380.86/x
  3. Step 3: Cross multiply
    1,258.37x = 1,887.83 × 380.86
  4. Step 4: Simplify right side
    1,258.37x = 718,995.17
  5. Step 5: Solve for x
    x = 718,995.17/1,258.37
  6. Step 6: Final answer
    x = 571.37

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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.