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Finding the Fourth Proportional to 1,257.09, 1,885.65 and 391.42

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Solution

The fourth proportional to 1,257.09, 1,885.65 and 391.42 is: 587.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,257.09 : 1,885.65 = 391.42 : x
  2. Step 2: Convert to fraction form
    1,257.09/1,885.65 = 391.42/x
  3. Step 3: Cross multiply
    1,257.09x = 1,885.65 × 391.42
  4. Step 4: Simplify right side
    1,257.09x = 738,081.12
  5. Step 5: Solve for x
    x = 738,081.12/1,257.09
  6. Step 6: Final answer
    x = 587.13

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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.