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Finding the Fourth Proportional to 1,257.16, 1,885.86 and 379.60

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Solution

The fourth proportional to 1,257.16, 1,885.86 and 379.60 is: 569.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,257.16 : 1,885.86 = 379.60 : x
  2. Step 2: Convert to fraction form
    1,257.16/1,885.86 = 379.60/x
  3. Step 3: Cross multiply
    1,257.16x = 1,885.86 × 379.60
  4. Step 4: Simplify right side
    1,257.16x = 715,872.46
  5. Step 5: Solve for x
    x = 715,872.46/1,257.16
  6. Step 6: Final answer
    x = 569.44

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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.