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Finding the Fourth Proportional to 1,257.89, 1,887.11 and 380.46

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Solution

The fourth proportional to 1,257.89, 1,887.11 and 380.46 is: 570.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,257.89 : 1,887.11 = 380.46 : x
  2. Step 2: Convert to fraction form
    1,257.89/1,887.11 = 380.46/x
  3. Step 3: Cross multiply
    1,257.89x = 1,887.11 × 380.46
  4. Step 4: Simplify right side
    1,257.89x = 717,967.97
  5. Step 5: Solve for x
    x = 717,967.97/1,257.89
  6. Step 6: Final answer
    x = 570.77

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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.