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Finding the Fourth Proportional to 1,252.90, 1,728.35 and 957.66

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Solution

The fourth proportional to 1,252.90, 1,728.35 and 957.66 is: 1,321.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,252.90 : 1,728.35 = 957.66 : x
  2. Step 2: Convert to fraction form
    1,252.90/1,728.35 = 957.66/x
  3. Step 3: Cross multiply
    1,252.90x = 1,728.35 × 957.66
  4. Step 4: Simplify right side
    1,252.90x = 1,655,171.66
  5. Step 5: Solve for x
    x = 1,655,171.66/1,252.90
  6. Step 6: Final answer
    x = 1,321.07

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.