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Finding the Fourth Proportional to 1,257.40, 1,885.54 and 391.52

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Solution

The fourth proportional to 1,257.40, 1,885.54 and 391.52 is: 587.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,257.40 : 1,885.54 = 391.52 : x
  2. Step 2: Convert to fraction form
    1,257.40/1,885.54 = 391.52/x
  3. Step 3: Cross multiply
    1,257.40x = 1,885.54 × 391.52
  4. Step 4: Simplify right side
    1,257.40x = 738,226.62
  5. Step 5: Solve for x
    x = 738,226.62/1,257.40
  6. Step 6: Final answer
    x = 587.11

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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.