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Finding the Fourth Proportional to 1,257.58, 1,886.69 and 391.90

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Solution

The fourth proportional to 1,257.58, 1,886.69 and 391.90 is: 587.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,257.58 : 1,886.69 = 391.90 : x
  2. Step 2: Convert to fraction form
    1,257.58/1,886.69 = 391.90/x
  3. Step 3: Cross multiply
    1,257.58x = 1,886.69 × 391.90
  4. Step 4: Simplify right side
    1,257.58x = 739,393.81
  5. Step 5: Solve for x
    x = 739,393.81/1,257.58
  6. Step 6: Final answer
    x = 587.95

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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.