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Finding the Fourth Proportional to 1,257.96, 1,886.94 and 392.34

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Solution

The fourth proportional to 1,257.96, 1,886.94 and 392.34 is: 588.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,257.96 : 1,886.94 = 392.34 : x
  2. Step 2: Convert to fraction form
    1,257.96/1,886.94 = 392.34/x
  3. Step 3: Cross multiply
    1,257.96x = 1,886.94 × 392.34
  4. Step 4: Simplify right side
    1,257.96x = 740,322.04
  5. Step 5: Solve for x
    x = 740,322.04/1,257.96
  6. Step 6: Final answer
    x = 588.51

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Double scale
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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.