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Finding the Fourth Proportional to 1,257.28, 1,886.80 and 608.32

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Solution

The fourth proportional to 1,257.28, 1,886.80 and 608.32 is: 912.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,257.28 : 1,886.80 = 608.32 : x
  2. Step 2: Convert to fraction form
    1,257.28/1,886.80 = 608.32/x
  3. Step 3: Cross multiply
    1,257.28x = 1,886.80 × 608.32
  4. Step 4: Simplify right side
    1,257.28x = 1,147,778.18
  5. Step 5: Solve for x
    x = 1,147,778.18/1,257.28
  6. Step 6: Final answer
    x = 912.91

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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.